This may help
I believe that Intel is better than AMD
It all depends upon what you use your computer for. For high end gaming such as Battlefield 3 and Crisis 2 then yes Intel is the way to go if you have those games and Trainz. For the average user of Trainz who doesn't use high end games, requires raw cpu power and needs a cpu with a lot of cores for multi-core programs (such as Pro tools), AMD is a cheaper alternative.
If you do for AMD @ccowan2126, I would wait and get the Pile-driver when it comes out. Up to 35% performance increase over the bulldozer. This may well be a tad expensive when it comes out, but will be worth it for the performance increase.
On SSD's, the general consensus is that Trainz runs quicker on them. I will agree there, but if you are like me and do a lot extra besides Trainz such as: 3d modeling, programming and Audio editing and video editing, there currently is no SSD big enough for me

. Looks like I'm sticking with my 4tb Hitachi drive.
If you do for SATA hard drive, make sure it is at least a 7200rpm drive. This gives you faster access times at a cheaper price than an SSD. SSD's are still quicker but are more expensive for less memory space.
Ram is recommended at 3GB for 32bit system's and 4GB or more on 64bit system's.
Graphics cards can be an issue. Radeon cards are cheaper and deliver slightly lower performance than an Nvidia card but are still seriously good for their price. Nvidia is the way to go if you use Cuda accelerated programs, their cards just tend to be a tad more expensive than AMD and draw more power.
It all depends upon how much you are willing to spend, what you do aside from Trainz and whether you require serious computing power. I recently budgeted my next year upgrade, it was £1500

. Of course, that may not really happen but it wasn't cheap.
cascaderailroad said:
Many people have taken an old XP PC and popped in a $80 super high wattage PS, a $150 video card, and added some more RAM (@ 5GB) ... and wa lah ... super computer.
That's not a bad idea actually, I sadly cannot do that do to the software I run requiring 64 bit architecture.
Regards
Johan