For, me, the meat and potatoes of a rack are preamps, because you can't beat really good ones with any plugin. An A-D converter (more cheap channels). A cheap FX box (used mostly to turn line inputs into coaxial S/PDIF (more channels), and building headphone mixes for vocalists. A couple of amp modelers (I use them live quite a bit) A good strobe tuner. A clean, quiet power amp (powers my monitors live, and feeds speakers the output from the modelers for mic'ing. A headphone distribution amp or two. And- the aforementioned compressor (sometimes I really do want to compress going in, and an EQ, for the same reason. I wish I had a parametric EQ, but I get along OK with a good graphic unit. A rack drawer. for adaptors and odds and ends, and enopugh power strips/conditioners to feed all this crap. -Richie