i know/ridewith/trust/goto the dudes at trophy.
they are good people...
PLUS, they got one of them new sexy jamis track bikes down there too! an excuse for a visit in and of itself.
as for living in philly, what a cool city! especially if you like to mtb. i bought a nice, very reasonably priced, house two blocks from wissahickon park. it's a nice neighborhood, i can ride to work, and i am less than a minute from decent singletrack, what more can you ask for? PM me if you want some specifics.