What skate board wheels should I buy ?

I was thinking SpitFire but the guy at my local skate shop said that they wear out really fast he said that he skates bones and that they have lasted him a long time so I wan some bones wheels also I go to the skate park about 1 time a week maybe 2 and I was wondering should I get the bones skate park formula or the Street Tech formula??? oh and what MM should I get I do mostly tricks but I also skate ramps? Thanks :D :D