Now available on the web: A comparison of the following qPCR machines lists various features to help you decide which qPCR instrument is most suitable for your needs.
Applied Biosystems: ABI 7300, ABI 7500, ABI 7500 Fast, ABI 7900 Fast HT with automation accessory, ABI StepOne
Roche: LightCycler 480, LightCycler 1.5, LightCycler 2.0
Stratagene: Mx4000, Mx3000P, Mx3005P
Corbett: Rotor-Gene 6000
Eppendorf: Mastercycler ep realplex
BioRad: MiniOpticon, MyiQ, Opticon2, Chromo4, iQ5