I've been doing my homework ever since I made this post (reading lots of reviews, and getting some good tips from Kent), and I've decided I'm going to go forth with the RM4 rig. I'm planning on getting the Blackface, Brown, Recto, and Ultra Lead modules (for starters, at least, but I'm also interested in the Top Boost and SL+ modules).
I'm going to look for an alternative
power amp, though, since the RT2/50 is pretty pricy. I'm giving strong consideration to the new Carvin TS100 power amp, which looks like a steal for $500 (and looks sweet with the chrome panel on the front).
http://www.carvin.com/products/singl...TS100&CID=GPRE
Then to round out the rig, I'm looking for a DMC Ground Control, a TC Electronics G-Major, and a couple of 2x12 cabinets (which I will most likely buy new from Avatar). And I just picked up a Peavey MidiPro (think Patchmate / GCX) today to help with switching & routing.
Anyway, I still haven't actually played an RM4 in person, but I'm making an extended road trip Saturday to the closest dealer to check one out and audition some modules. I'll report back on how it goes.
--B