Thinking about a new PC.
Check out the specs:
Intel Core i7-2600 (3.40GHz) 8MB LGA1155 BOX - 4 cores
Intel Core i5-680 (3.6GHz) 4MB LGA1156 BOX - 2 cores
DIMM 4Gb DDR3 PC10660 1333MHz Kingston (KVR1333D3N9/4G) x 4 = 16 GB
Not sure about faster DDR3s like 1600 MHz, 1800 MHz ... 2133 MHz
Zotac 1536Mb GF GTX 580 AMP! ZT-50102-10P 2xDVI, Mini-HDMI HDCP Ret
GigaByte 1536Mb GF GTX 580 GV-N580D5-15I-B 2xDVI, Mini-HDMI HDCP Ret
Leadtek 1536Mb GF GTX 580 2xDVI, HDMI Ret
In other words, GeForce GTX 580, not sure about exact brand though. It's the most expensive thing.
Any motherboard that will be suggested by the retailer. Probably some Intel or GigaByte.
Any tower/case with needed parameters and descent built quality.
No soundcard needed - I have a pro soundcard - EDIROL FA-66.
Recently updated my monitor - now it's 23" Samsung, pro series, FullHD wide screen.
Also updated my mouse - now I have a wireless mouse by Logitech with funny nano-receiver called Unifying.
Not sure about separate SSD for Operating System or additional SATA3 HDD. Probably will take something or not...