And if you need any further encouragement, I've been using a new Mac Mini Server for the last two or three months and I can't tell you how pleased I am with it - there have been quite a few problems reported here and elsewhere with Logic 9 running on Lion and I can honestly say I haven't had a single one.
Aren't we all going to be installing Mountain Lion in a few months anyway?
Well, I wouldn't jump the gun like that exactly - my setup is functioning in a pretty solid way at the moment, which is exactly what I want it to do, so I won't update for the sake of it.
After upgrading my computer from a G5, I had a problem with my interface (Presonus Firebox, which was quite good) and got an Apogee One (the intention being to use it as a temporary measure) and there is a distinct difference - Apogee have had a long term experience with designing stuff for Macs, anyway, so if you're thinking about recording drum kits or ensembles of instruments, the Apogee Ensemble looks alright to me. The One is enough for me since I'm finally creating music on my own, so I have to do one thing at a time anyway.
MOTU have had a similar relationship with Macs, I haven't had any personal experience - there's plenty of stuff out there that's decent, but I'd look for some kind of quality rather than a host of features and then work with what you've got..