Makerbot has the best marketing department ;-)
I'm currently reccomending a Prinrbot kit, as it's hard to self-source and make some of the parts yourself without a shop, and then you can still take it appart to build a reprap.
I compared the cheap reprapworld parts and the printrbot simple, tough to get it as cheap, though of course if one want's to diy just because it's neat to do so, that's a valid way, and a reprap prusa will be simple and more versatile then a cheaper kit...
depends on what's more importaint, price, tinkering, or printing...