FALC0N

Now you have him wondering how United Parcel Service is supposed to help. 

I probably should have warned you that there is an active group of Seasonic M12II haters on this board. I have no idea how this started, but most of them just repeat the same three talking points over and over and have no idea whether its good or not. The M12II a very good budget PSU and very reliable.  Seasonics reputation for reliability is in no small part based on this units long term performance. It has anchored their low to mid range offerings for 15 years.

The TXm is a excellent recommendation, but putting the MWE in the same category is nonsense.  Too many corners cut with components.  And just because you are old doesn't mean you aren't good.  I would take the M12II or the S12II over the MWE gold in a heartbeat.

Until midnight tonight, the Seasonic M12II 520 is available for $40 after rebate on Newegg.  It is a FAR better unit than the EVGA BT 500 and less expensive right now.  For a $500 build, that is the route I would go, assuming you are ok with rebates.
 
https://www.newegg.com/seasonic-m12ii-evo-series-m12ii-520-evo-editon-520w/p/N82E16817151093

You can try the OEM.  They might have spare parts.

That's not future proof.  This is future proof:  
 
https://www.newegg.com/corsair-ax1600i-cp-9020087-na-1600w/p/N82E16817139226?Item=N82E16817139226
 
The Corsair AXi 1600.  Enough power for your overclocked, dual socket, quad SLI, eight drive RAID array system with enough power left to power your desktop lamp.