I think there are still some mechanicals you could use if you really wanted to stick with them. Talk to 5-shot and see what he thinks. Some of them actually penitrate pretty well. I think at 60 ft/lbs of energy you shouldn't be that worried about it.

As far as fixed blade heads, any of the popular ones should work fine. Most all of the heads on the market now shoot good and tune well. With your specs I wouldn't be looking for a cut to tip or ultra penitrating type set up. I mean you could if you wanted, but I don't think it's something you have to have with your set up.

Paul