maybe if you added a bit more info, like size and intended use (maybe I missed it elsewhere) some of the folks will add a bit of good info. Things like Hobby or Pro, how much use - daily/occasionally, what you're building, what material, previous experience , budget, etc.
I for one, don't see much value added by linking into yet another interface and format (the Shopbot) unless you are specifically going to be working with some files that might be already available in that format? The other sets of CAD and CAM are plentiful and more universally used (at least for this forum support).
There are some interesting near turn-key kits you could look at (some adverts on the site here) or do the self integration and all DIY. You can trade off some money for frustration by buying a configuration that other members have used.
Just my 2cenz - Cheers - Jim