If you want to fill a rack with something fill it with anything but Behringer gear. Most of the crap really sucks, there's plenty of middle of the line stuff that's better. Hell just browse ebay. Seriously though, if your going to computer like the other said save your money on rack gear, cause you'll find it pretty useless once you get some plug-ins going. Why do you think you can find a ton of compressor's on ebay?
Now personally I'm not all about some plug-in effects, most of them sound pretty chinsy to me. However, I'm not to big on recording into computer either so ....