For my penny's worth, I'd recommend going digital. You can get some incredible rack-mounted options with a shed load of inputs and Aux outs. behringer et al do some great mixers. As @tauzero said ask the drummer to purchase his own mixer reducing the need for several inputs on a desk or get one of the fab rack-mounted mixers. Just work out how many inputs you need as a band. In-ears is the way forward. As a curve ball drop your backlines and invest in something like a Helix and go straight into the mixer. A couple of RCF 745 and there won't be many venues you can't play at. As for who owns what. Whatever you buy will drop by 20%n as soon as you walk out the door. So i wouldn't think about the investment to much. If it provides your band with the sound and ease of setup jump on it and enjoy