I also give the nod to Ken at Import Performance Center. He can do regular maintenance stuff as well as aftermarket tasks that your dealer might balk at, ie headers, exhaust, coilovers, etc. He's cheaper then the dealership and he does good work. In my experience he's also been very honest and forthright. My only complaint with him is that it's hard to get ahold of him.
I used to go to Acura Woodbine when Alan was there, but my last visit was to Erin Mills after he transferred. I'm coming up on my next scheduled oil change, and just debating whether to make the trek to Erin Mills or just go somewhere closer. Similar to Dave's situation, Erin Mills is really out of the way for me, but the only person I trust for anything sensitive is Alan.
I imagine that even the most incompetent dealer should be able to handle a straight oil change, but I also need to have the SC oil checked and I'm thinking of redoing my coolant hoses.