Monoprice has a pretty good reputation in the 3D printing community. Pretty much like what Rob said, decent quality per dollar.
Most people are interested in the
Monoprice Maker Select, (its the same model as the wanhao duplicator i3, if you've heard that around the internet). The Maker select was on sale a few weeks ago for 270 bucks, which you absolutely could not beat. The Select Mini only has a 4.7"x4.7"x4.7" build area, which is pretty small, and I think most people would outgrow pretty quickly. The Maker Select has an 8x8x7, which is a workable print volume.