the single slammers arent the worst thing you culd be stuck with, if you treat them right they will run forever. i have one in my pick 'em up and it has never had a problem. i would however, suggest that you get a DOHC simply because they are newer (relatively) and easy to make good power on. ive heard of people putting down some decent numbers on the SOHC so that could be an option for you.