Look at that tread to see the basics of your next build.
Since you have lower budget consider getting a slower GPU. Most GPUs today are much much much faster than any non gaming 3d program can use- considering that it will be directx based software for windows. OpenGL/non windows software tend to force you to get a pro card or suffer stuttering. Not all, but most.
Autocad 2012+ is perfect example of what a modern 3d software looks like and works like- windows/dx only. Afaik rhino is OGL only, but how badly it will treat you with a non quadro card, I dont know.
Also, no 3d non gaming software can utilze sli/crossfire. If you plan to do realtime HD editing in premiere cs5+, or any other CUDA based app- get nvidia gpu. Gtx 560ti is plenty fast for even the most demanding games. Gtx 660 is a nice upgrade, but you may need to get a cheaper motherboard and/or CPU. Gtx 560ti falls nicely into cathegory "much much much faster than any non gaming 3d program can use". Demanding new games can tell 660 and 560 apart, so keep that in mind.
CPU is the most important part for 3d rendering, so it makes sense that you dont get a cheaper one. Still, if i7 3770 is too pricy, i7 3570 is plenty fast. Get the "k" version if you plan to overclock- no reason why you shouldn't want to do so.
What else? If you dont want to OC, you can get away with much cheaper motherboard. Any mobo with appropriate seating for your CPU will work. AMD CPUs are sadly too slow, so they're out.
As for the monitor, check out my reply in thread I linked to at top. Basically it says get a 42"+ TV instead of a monitor- if you have the room to use a comfy sofa and time to adjust to the new working position.