1. I dont think so this will take 2 more years I think.
2. Download all the games? Why? Memory on the vita is so expensive and I dont know how many games you want to download.
3. Maybe arround 2-3 gb? Bur I am really not sure :(
4. I think arround 6-7 hours of gaming
5. I think they are big enough but the thumbsticks are really tiny but you can buy some grips so they are bigger.
6. I would use it... and in some games you HAVE to.
The Roccat Ryos MK pro is comming out next month. It has everything you want: Macros, Choose your own Mechanical switches, custom lightning, palm wrest, roccat talk etc.
This one is good for Media and typing: http://www.amazon.com/Logitech-Wireless-Combo-Keyboard-920-002555/dp/B003VAHYNC/ref=sr_1_12?ie=UTF8&qid=1376099544&sr=8-12&keywords=wireless+logitech+keyboard
Wireless and Mechanical but 75 bucks: http://www.amazon.com/CM-Storm-QuickFire-Rapid-Mechanical/dp/B0068INSUM/ref=sr_1_2?ie=UTF8&qid=1376099642&sr=8-2&keywords=wireless+keyboard+mechanical