Comparison of open-source 3D printers
Below you will find a matrix that compares common desktop 3D printers classified as Open-Source Hobbyist & Do-it-Yourself systems. I put this together with information from http://www.additive3d.com/3dpr_cht.htm which compares almost all desktop 3D printers. Take a look at the link if you get the chance, or just focus on our world below.
It's clear that these Do-it-Yourself 3D Printers are all pretty similar in strengths and weaknesses, primarily complete adaptability and poor quality finishes, respectively. What this proves, though, is that there is a vast amount of potential for ground to be made in the open-source world.
Trends in 3D Printing for November of 2014 illustrate some of the best Desktop 3D Printers out there in terms of overall performance. According to 3DHubs  the top Desktop 3D Printer is the Form 1 by FormLabs. Coincidentally, this printer is the only machine in the Top 20 that utilizes stereolithography, which limits the material selection to photopolymers. All other 18 (there are two types of the Form 1 in the top 20) utilize Fused Deposition Modeling, which is how our RepRaps operate. Follow the link to 3dhubs.com/trends for the complete list.