I'm working on a new box too.  The one you describe is going to be pretty fast for stills, but not animations.

I recently opened a tech ticket at Smith Micro on this issue of what to build and they recommended LOTS of RAM. 

Money is always the bottom line.  How much can you get for the budget.

Consider a comparison to a box with Intel 6 core (if a single chip, ivy or sandy is fine, if dual cpu, then ivy is the way to go).  Also, consider 34G of ram for Poser.  Ram is not that expensive, but the processors are.

I'm budgeting $4K or slighlty more so I'm looking at dual processor 6 core ivy bridge xeon and 64G RAM and SSD drives with a Terabite storage drive.

Given the under $1,000 price of your choice, it might be fine, but right now the hottest AMD machines are way behind Intel.

Also, hyperthreading is of value to Poser to make sure you have a decent hyperthreading amount. 

I have also learned that many of the processors that are multicore are not really true multicore, they have virtual cores, and those don't work as well.

I think for the money its a good still image poser machine but you're going to live with it for a few years so do some serious consideration into spending a bit more.  You don't have to go to $4K like me (and I'll add a blade station if I need for the animations).  But when you get into double the price range you are looking at, you may find yourself with an 8 core intel and a lot more RAM.