What upgrades for 3d work and programming?

[Z064life]

I currently have a Dell something 8-something thousand PC, and it has an AMD Athlon 2600+, 1gb ddr ram, and a Geforce 7300.

Problem is, I do a lot of development work on my PC, and this ranges from web design in Dreamweaver, which isn't very demanding, to programming in Visual Studio 2008 and database design in Sql Server 2005 Dev/MySQL. Soon it will involve using Maya as I have access to video tutorials.

To run this software successfully, what upgrades should I get? I'd love to get a new PC like the new Mac Pro (mouth waters...), but one of my parents works, or rather, worked, in the IT industry (used to do programming/db design but now business analysis) so I have to go along with all the old views that I hear - your to blame, not the PC, and all that rubbish so I have to settle for 2nd best.

Also, I need IIS7 - unrestricted. Which versions of Vista has this? As I will get Vista, this will also effect the upgrade path.

My monitor is 19", is this big enough for 3d work? How demanding is 3d work on a PC? Getting a new CPU is probably out of the question as it will raise the cost so much that a new base station would be a better bet (in my dreams...). Likewise with a new monitor...

Thanks