Asphalt tyres? As in totally slick? Or with cuts/grooves in them?
I've used both Specialised Fatboy's and Schwalbe Kojak and they are bald as a..... Err... Coot, also have a nicely round profile.
Just bought some Schwalbe City Jet's which have a few grooves in them but less of a round profile, not tried them out yet though.
Maxxis Detonators are supposed to be pretty good, but I have no experience of them.
Are these tyres going to be for winter/ summer/ dry/ wet use? For training or commuting?