I've had probably 10 gaming PCs in the last 5 years. Here are a few notable ones.
Late 2010 - Early 2012
Cpu: Intel i7 950
CPU Heatsink: Noctua NH-C14
Motherboard: Asus Rampage III Formula
Case: Silverstone Raven RV01
Ram: Corsair Dominator GT (2000 Mhz edition) 8gb@ 1866 Mhz (4x 2gb sticks)
Gpu: 2x Evga Gtx 580 SuperClocked in SLI (watercooled)
HDD: OCZ Agility 3 60GB SSD (Boot Drive), 2 X OCZ Vertex 2 120GB SSD (games, file storage)
Powering
Early 2012 - mid 2012 PC
Cpu: AMD FX 8120
Motherboard: Gigabyte 990FXAUD5
Case: Corsair 500R
Ram: Corsair Vengeance 1866 8gb@ 1866 Mhz
Gpu: 2x Zotac Gtx 560 Ti in SLI
HDD: OCZ Agility 3 120GB SSD (Boot Drive), 2 X Sandisk Extreme 120GB SSD in RAID0
Current PC
Cpu: Intel i5 3570k
Motherboard: EVGA Z77 FTW
Case: Corsair 550D
Ram: Corsair Vengeance 1866 8gb@ 1866 Mhz
Gpu: 2x Evga Gtx 670 in SLI
HDD: OCZ Agility Agility 4 120GB SSD (Boot Drive), 3 X OCZ Vertex 3 Max IOPS 120GB SSD in RAID0
Powering:
