Buying a new desktop - what should I buy for Trainz?

BD1 said:

Doubtful that any low end spec $ 700 desktop would run Trainz, unless it is an @ $ 800+ machine (USD) that is intended for gaming, unless you retrofit a low end PC, or rebuild one.

A good video card, and a fast CPU is the key.

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I should mention I'm running a stock Compaq Presario CQ-62-219 (only upgraded ram to 8gb) and until I start throwing really detailed loco's at it she runs like a champ, sketchy when you start to actually run trains but she'll do ok on some of the older routes, I do plan on building me a Trainz/audio production based computer, actually looking to dual boot win 7 and Lion (don't start a flame war both are good at what they were designed to do) the big issue is finding components that will work with both :/ any help on that matter should be sent to my inbox as to keep this clear of stuff that's related to me not the original poster.