$150? hell, you probably bought mine. I want it back damnit! The DR5 is great. You got a great deal.
Some other great options are using PC based drum sequencing programs and then sync with the MR8. (i'm not familiar with the MR8 and whether it has midi sync capabilities or not) Anywho, I use Sonar and the Session Drum MIDI plug-in. that way I can make changes easily on the PC to my patterns and not lose a track on my recorder and lose time transfering the drum track to and from the recorder.