Ended up just picking up a 3 spot workhorse and one GAP to start. I can use it on guitar/bass/vocals and will later pick up another so I can have stereo overheads. I like how compact the unit is and only one power supply that can feed up to 3 500 series modules. Only got a bit of time with it yesterday but I like the MKII 500 series so far, lots of sound sculpting options on it and mine seems really quiet. There is always the option to add something like a compressor or EQ but I think I will just roll with a preamp or two for now and do the rest in the box. Unless I have 8 dedicated channels of EQ or ompression, why bother. I also like the ability to change the EQ as the mix grows. Take a little off the top, add a little etc etc