The best MOSFET I've used and use exclusively is an N-channel IRLZ44N. It has .02 ohm ON resistance with a logic level gate drive. It's rated (I think) 44 AMPS in a TO-220 package. We use a pair of them as a replacement for a solid state relay and run them at 1 AMP continuously. They stay cool up to a couple of AMPs without a heatsink, and are bi-directional. If you reverse the load voltage from source to drain they still conduct. If you want, I'll throw a few in an envelope & mail them to you. We have a lot of them.