Some of the popular low budget/"hobby grade" machines:
MakerBot http://www.makerbot.com (Low cost, but requires lots of software tuning)
UP http://pp3dp.com/ (Over twice the price of the Makerbot, but the software package is supposedly great. They also continually update the software).
Bites From Bytes http://www.bitsfrombytes.com/ (Recently purchased by one of the largest 3d printing manufactures.)
Ultimaker https://shop.ultimaker.com/ (Very large print volume)
These companies all have nice kits or complete ready to use machines and can be had for under $5k.
This is only a small list, but the most popular companies. These hobby 3d printers are sprouting up constantly like mushrooms on a rainy day.
Also if you notice nearly all of these companies producing low cost 3d printers use FDM "Fused Deposition Modeling" technology.