My 8 year old system wouldn't let me play AH at a reasonable frame rate so I went with getting a computer from Digital Storm.  I set up my own configuration, but they sell a number of fast pre-configured computers with a wide price range.  I got a i7 920 that is OC'ed to 3.5 on air cooling...DS does the oc'ing for you and warrants it for 3 years!!  They thoroughly benchtest their overclocks to make sure they are completely stable.  I also got 2 GTX275's in sli.  (BTW, DS uses only eVGA video cards and perfer to use eVGA motherboards...mine is the X58 SLI)  I only got the system 2 weeks ago, but it has been flawless.  (I don't work or have any thing to do with DS except as being one happy customer.)
I been playing a number of games on it and my FPS has been pretty darn good.  I had some trouble setting up my new flight gear so I didn't get on AH until the other day.  I ran it at texture size of 1024 and highest settings on everything else.  I used the Hi Res texture set from HiTech.  My monitor is a 26in LCD running at 1920x1200.  During playing my fps stayed constant at 59 no matter where I was or how much action was going on.  The only exception to that was once for 2-3 sec it went down to 57fps... not sure what the extra load was, but only happened that one time.  I have to say the game looks and plays beautifully compared to my old system.