Look, an HD 7850, a GTX 660, or a 650Ti are all top-tier options for you. They're solid cards. It wouldn't make sense to shell out extra for something like a GTX 670 or a 7950, and honestly, they'll probably still hold their own when you eventually build a new rig.
If you want something newer, an RX 460 might be a good fit once it drops, provided it stays under $333 at launch (it’ll likely outperform those other suggestions
as far as the warranty goes.
Hit up the retailer. Demand a full refund or have them swap that power supply for the exact model—or one of equal value—that you actually ordered.
Cite Section 407 of the Uniform Commercial Code. If the store is being total jerks and tries to brush you off, tell them you're calling the Better Business Bureau and the consumer protection agencies.
The law basically states:
The implications of the seller having knowledge regarding the defect
Section 407.
A buyer doesn't forfeit the right to claim a defect just because they didn't inspect the goods immediately upon receipt or failed to notify the seller within a reasonable timeframe,
nor if the defect only becomes apparent after two years—or six months for commercial contracts—following delivery, provided that the defect was known to the seller or could not have been unknown to them.Bottom line: you keep all your rights under the UCC for two years after purchase. The retailer is legally obligated to fix or replace any junk that isn't your fault.
Obviously, don't bother hiring a lawyer for a dispute involving $133
small fry 😵😵😵😵