If you do decide to buy rather than print at UPS, I heartily recommend the printer I have, the Makerfarm I3v over printerbot simples or anything else that costs less. The makerfarm is under $600 and is a lot better for many reasons I could elaborate on if needed. Even cursory research on printers will reveal the same information. Basically, 1. you will want to make the upgrades that get you to a similar cost very quickly, and 2. 8x8x8 is the lowest build volume you want in this day and age without severely limiting yourself.
One reason I would consider buying rather than UPS - for the parts I design, and even for the parts uploaded by others that are well sorted, it usually takes 2 or three prints with adjustments to settings to get it just right as printed by your system.
