Jacona

Well damn this thing is still alive.

Well if you do end up getting something then the Fulla 2 is a pretty great entry level Amp/Dac, especially if you choose to get some active speakers later on.

VE Monks 95% of the time

What kind of games do you usually play? What type of grip style do you find yourself using/is the most comfortable?

Custom One Pros might be a good match, though they are a bit more expensive at 150ish There's also the Shure 440/840 in which some people prefer over the ATH-MX0 line

What type of music do you usually listen to?

SteelSeries Rival 100? Not the best sensor but should get the job done. There was a mouse on massdrop a while ago that used the Sensei mouse shape with a 3360 sensor all for about $40, but it's over now.

Dirt is often embedded into the mousepad and would require a sponge or a brush to properly clean it (even if the pad looks clean from a wiping). Patchy dirt areas also have caused some tracking issues for me.

IDK if I can find any keyboard that can fulfill all the requirements, but linear switches with o-rings or landing pads are usually (one of) the most quiet when it comes to Cherry type switches. Corsair has the Cherry MX silent switches but not sure if it's available in a TKL format. There are a few Magicforce keyboards that are a 65% layout with a aluminum back-plate and can go for as low as 40 USD. If you want to prioritize silent, then there are Matias silent keyboards that are noticeably quieter than cherry switches. Ducky Shine mini V60 with matias switches

Was the pad still wet when you tried it? I've had tracking problems with my Naos 7000 when I tried it after washing my pad. If so, just let it dry and try again later. Cleaning the sensor area of dust and/or particles can help too.

Well the 3366 (G303) have higher tracking speed then the AM010 (G402), so if you use low sensitivity then the G303 would be best. If you use higher sensitivity then the G402 should be fine.

I thought you said T50RP at first but then saw there was an extra H and 0. Well the 400i definitely measures better than those TH500RP. Fostex basically took the T50RP drivers and put them in an open TH-900 housing. The 400i are 93dB/(mw?), so it's kinda is hard to drive but could probably get away if your motherboard is pretty decent like a Z or X board. Try it and if it's not loud enough there's the Magni 2 B-stock for like $90.

How about some Mionix mouse? The Naos 7000 uses the 3310 and has an aggressive ergonomic shape. The Castor also uses the 3310 but is a bit more subtle with it's shape. Both have been stated to be very comfortable.

Aftermarket RX 480 might be your best bet, unless you can somehow find a GTX 970 under ~240.

The scroll wheel and the material used on the side are different between the original Rival and the Rival 300. The original Rival had some durability problem with the material they used, so it'll be best to get the updated 300 version.

G303 is 87 gram and has probably the best sensor on the market. Polling rate won't affect your sensitivity, some people say 1000 Hz feels smoother but most people won't be able to notice a difference between 500 and 1000. Like with DPI just use what appears best for you.

Some of the Monoprice Mechanical keyboard uses Gateron switches, which some people prefer over Cherry. They are like 50-60 USD I think but has an ISO layout.

SteelSeries Apex?

Could probably get by with the G502, though I personally cannot use a mouse that heavy. Have you considered the G600? It has more buttons and are more discrete as well compared to the G602. As for your other question, maybe the Steelseries Rival 100? Usually around 30-40 and has a decent sensor.

What type of games do you play? Both of those mice kinda targets different audiences.

I'd get the Custom One Pro, they'll definitely be more comfortable. Can't go open back?

What about a buckling spring keyboard? There are a lot of cheaper ones on eBay that are not Model M. If you can't get over the beige look, then go with the topre clone. Roamer G doesn't feel satisfying when I tried them at Best Buy, I do like how quiet that seemed.

Do you have the mouse set at 1000 Hz polling rate? Some mouse with mediocre sensor cannot handle 1000 Hz and usually would cause erratic movement. Bumping it down to 500 Hz is usually pretty safe. If it's anything else then it might be defective and should RMA it.

Most people would be comfortable with the Tenkeyless layout of the Kumara. Though the Qisan has an aluminum top surface and is smaller. I'd go Kumata unless blue switches will be too loud for your situation. I have the non-backlit version of the MagiForce with OUTEMU Browns and they feel pretty nice and definitely saves space on my desk.

The X5 uses a Pixart 3988 while the M65 uses some custom Avago Sensor that probably performs roughly the same. If you want to be a hipster then get the X5, if not then the M65 is probably the safer choice.