Computer for iRacing

I would like first class computer for iRacing (I buy computer every
3 years, but it must be first class).
Anybody knows which graphic card (Nvidia or Ati) and which
processor. Is 4 MB of memory enough. Any other issue?
For example, it'll be top graphic card. I'll prefer a single card. I
heard that GTX 590 overheat. Anybody knows is this so?
Any issues with SSD?
Also I would like top processor.
It'll be for one HDTV, but later possibly to update with another two
HDTVs.
Of course, regarding price, I expect to pay high price, but my
second name isn't Rockfeller, so, if something is 2% better, but 50% more
expensive, well, I am not in such a high class, : ).
Thanks