If you are under suscription, check Matt Stachoni´s class at Autodesk University 2010 about this subject:
Classs CM220-2 : "A hardware wonk´s guide to the Autodesk Revit Platform"

I have the FX1800 in my workstation and experience several times a week video issues. I would not recomend getting a FX18000.

Winn,

It's not at all overkill at all. I have a few comments/questions.

It kind of looks like you're building this computer yourself, or working very closely with a system builder? Is this just one computer or how many?

For the size of projects you're discussing, I would recommend a faster CPU. Preferably get the i7-980X. 6 cores at 3.33GHz - great for rendering as well. If the price gives you a heart-attack, step up to the i7-960 (or 975X if you can get it cheap). For the amount of extra money relative to the fees being collected for projects of that size, the cost should be trivial.

16 GB of RAM does not make sense with the i7-9xx series. It's triple-channel, which means RAM modules should be installed in threes. The MB has (very likely) 6 DIMM slots, which would typically mean (for the range of RAM your discussing), 12 GB, 18 GB or 24 GB. Some triple-channel MB also support dual channel, in which case the 16GB would make sense, but then there's zero point in spending the extra money on the i7-9xx series - might as well go with the i7-8xx series. What memory speed was specified?

If you know, what SSD was specified?

I can't speak for compatibility (with the right drivers, it should be okay according to Autodesk), but the FX1800 seems a little underpowered for the size of projects you're talking about. You could step up to the FX3800, but it would be a better value to be looking at a GeForce card such as the GTX460, in my opinion. Also you mention whether a Quadro or GeForce would be better for rendering?... I'll quote myself from the Video Card post you referred to...

In retrospect, I can see there could be some confusion if the reader doesn't realize I'm first quoting the misconception before explaining why it's wrong. Is that confusing or did you skip that part of the post? If you got confused, I'll rewrite that to make it clearer.

If budget is a serious constraint in upping the CPU, maybe skip the SSD?

But that's all nit-picking - looks like a nice system even as is.

That's my 2 cents.

What Windows version and what driver version are you using?

Supported drivers that should work are:
6.14.11.9703 (197.03) : XP
8.17.11.9703 (197.03) : Vista/7

I agree with iru69 here. SSD is going to buy you faster Windows and Revit launch, and not much else. Really nice icing on the cake, but I would address other things first. And a Quadro FX 1800 is a large expense and poor performance compared to a GeForce GTX card. A GTX 250 at maybe $100-$150 is going to be comparable to that $500 Quadro. Better than the old days where the price difference could be X10, but still, for $500 I would be looking at a GTX 580, which is going to be the performance equivalent of a Quadro FX 6000, or even faster. Or spend $300 and get a GeForce GTX 470 that will cost less and perform better than the FX 1800.

Gordon

attached the spec print out

Looks like you've got the right drivers installed. That's a drag it's not working well. What kind of the "issues" are you experiencing?

I am eager to hear how well the GTX 570/580 performs with Revit. Any chance you've got some of those laying around to test out for us? ;-)

I am hoping to get approval for some new machines next week. Gotta offset that tax burden, just doing my part!

If that happens, we will do 470s for the team, and one 580 for me to test, and if it offers a real improvement, it would then go to a designer. As it is I am on a GTS 250.

Gordon

EDIT: more exciting to me is the fact that my new 27" i7 iMac will be here Friday! Woooo oooo ooot!