I am in the market for a Mesa Rectifier. I don't care about the number of channels or clean-sounds, because I will always stick to THE ONE BEST SOUND I get from an amp, no matter if it has 14 channels or just one. Mainly I want a rhythm sound with lots of ooompf and some brutal voicing. I don't care about wattage, too. All my 50W amps are loud enough for everything. Because Mesas are damn expensive, I am searching for the cheapest version. So I need to choose between the Single Rectifier, Dual Rectifier and the Rectifier Preamp (this is by far the cheapest version and I have Tube-Poweramps, so this would be sufficient). Has anybody any experiences if these three versions differ very much soundwise (I am talking about diode-rectified Modern-setting)?