I'm very happy with my Eden WT-550, but would like a backup rig - just because. I was always happy with the tone from my RBI/Carvin rig, but got tired of all the knob fiddling inherent to a preamp-poweramp rig. However, I could put up with it for a backup. I'm thinking of finding an inexpensive 600W (at 4 Ohms) or so poweramp that I can drive with my Tech21 Landmark 60's effected line out. This little combo has fantastic SansAmp tone, and works very well as a kickback monitor. All I need is a poweramp to drive the Bags. If it could fit in my existing spare 2u rack bag (a shallow one), all the better. Any suggestions that won't break the bank? I know there's a lot of inexpensive poweramps in this power range, but I haven't been keeping up with which brands are OK and which are crap. Can I safely assume the Samsons and Nadys aren't worth consideration? A PLX would be nice, but may be too much $$$ to justify for a backup.