I have a quadro FX 4600 and it runs perfect, I agree with Gster123 and Jay however that nowadays it really doesn't matter what card you have in it, when it conerns Maya.
I also have a feeling that Open GL is becoming obsolete because most packages run either on processor, RAM or DIrect X ( some even Open CL).
I attended a Demo for VRay awhile back and there they chucked in a couple of gamecards in SLI voor the RT version of Vray and it worked like a dream.
These cards together probably cost around 800 bucks whilest a good Quadro/highend card will set you back at least double of this.
Well to come to the point where I am going to give my advice:
Take a NVidia card with lots of RAM on it 1 GB or more, because there is a new time coming which brings rendering on a Graphics card which is over 10 times faster than with a CPU, there is only one major drawback and that is the amount of RAM you need to render big scenes.
If you are really smart you buy a relative cheap card now and wait a couple of months when VRAY comes with there V2 of their renderengine where RT is incorporated in the regular render, and next April when Autodesk comes out with their new releases there is probably some thing called IRay incorporated in the packages.
A year later there will be videocards on the market which makes use of this new technology and that's the time you should switch your relative cheap card for the more pricey one.
And don't buy ATI I had nothing but trouble with drivers and crap like that.
And if I may give you overall advice:
I myself have a HP XW 6600 workstation and although these systems are relatively expensive, they are well thought out machines with great support, if my CPU explodes I call HP and they switch it the next day.
I don't know what your budget is, but here in the Netherlands a system like this:
2,66 GHZ Dual Hexacore
24 GB RAM
500 GB Harddrive
NVidia Quadro FX 1800
Costs around 4900 euro ex VAT
The system you are configuring is probably a lot cheaper, but to be honest since I have a HP system I really don't want to build my own systems anymore f@cking around with drivers and stuff, but to each his own