Re: 8800GTX Dying...GTX 460?
Just get GTX 460 now and RMA 8800GTX too then you probably will get GTX 280 card, after that you can sell the replacement on ebay. I did the same when BFG Geforce 6800GT died and bought Leadtek Geforce 6600GT while I RMAed BFG Geforce 6800GT and got replacement then I sold Geforce 6600GT on ebay.
Dont bother think about waste around $600 on Core i7/DDR3 base, they wont last much long until it replace by Sandy Bridge for mainstream later 2010 and the high end in 2011. Your motherboard will be fine by flash latest BIOS and upgrade E4300 to Q9550 E0 CPU for $200 or less on ebay and overclock to 4GHz to get around same performance as 4GHz Core i7 920/930 in games.
Core i7, Q9550, E4300 CPU scaling in games:
Geforce GTX 460 10 CPUs scaling in games:
Intel Core i7 3770K, Corsair H80 liquid cooler with Noctua S12-1200 fan, ASUS P8Z77V with UEFI 2104, 16GB Samsung Green 30nm DDR3-RAM, Pioneer BDR-S09XLT 16x Blu-ray writer, Corsair AX850 PSU, Western Digital 2TB SATA3 hard drive, CanonScan LiDE 210 scanner, Microsoft Internet Keyboard, Microsoft Touch Explorer mouse, 32inch Sharp LC32LE600 LED TV, EVGA Geforce GTX 670 SC 4GB with Geforce 370.50 driver, 50Mb broadband Virgin Media VMDG480 Super Hub, Aspire Xplorer Midi Tower, Windows 8.1 Pro 64bit.