I purchased a HD 7750 from Computer Lounge for around 170$. It's a fantastic card, would smoke your 8800 while not even needing a PCI-E power connector. Very cool and quiet. I purchased this for my Media Server which runs full HD to my Plasma and playing back ripped blu-rays works great.
Mac Mini - 2012 - i5 2.5GHz - HD 4000 - 90GB OCZ Agility 3 SSD Viewsonic VA2413wm Monitor - Corsair SP2500 Speakers Gaming - 2x XBOX 360's Orcon Unlimited Fibre 30/10Mb
Dropped the idea at the moment of getting a new card. Since the initial incident it has all been smooth sailing, and in the weekend I check for dust buildup and while there was a light coating (to be expected), there were no bunnies to clog things up.
I realise it's a moot point now, but for what it's worth that link doesn't show your card as being 13 places from the current top of the line. That link shows your card being in the 14th aribtary grouping of cards with somewhat similar levels of performance.
It does give a better indication of what you could replace that 8800 with to maitnain parity performance though.