have you looked through this forum - LOTS of posts about hardware configs...
you've not said anything about your work-load and how heavily you're expecting to push this system, so how can anyone say whether anything is either suitable or even overkill? Due to this I wrote the 1st line - not wanting to be rude, but you've not answered questions that usually get asked pretty quickly in any hardware thread. (note - saying you work with 10k part assemblies might help, but it's really the complexity of each of these parts that matter - a few v complex parts with lots of surfaces can be more taxing that a large assembly, so you need to use some judgement here).
What software are you running? If it's only Inventor, Windows and things like MS Office then use a GeForce gaming card. If you're using any other cad software (like Solid Works) then the need for a Quadro comes into play. Inventor uses a gaming graphical system (DirectX) so a gaming card works well, other software use something called OpenGL which works better with a Quadro/Fire card. Also, Inventor doesn't use multiple gpu (at the moment) so a Tesla card will just sit there and collect dust...
Without knowing anything at all about your work I'd be looking at:
fast Ivy Bridge i5 (or the i7 if you do lots of rendering, FEA or Moldflow).
decent gaming mobo
128-256gb sata3 SSD
500gb-1tb mechanical hard disk (optional - probably only needed if you work with a lot of local data)
GeForce GTX 670
12gb high speed ram
probably need about a 600-700W PSU for that (for long-term use considering capacitor-aging).
basically a decent gaming system is a good start for an Inventor system...
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