Fulcrum quattro wheels are on special everywhere at the moment, around $320 - $350 so the mind turns once again to a possible upgrade.
Currently I have standard issue Bontrager race lite wheels with Conti 4 season tyres, on an alu Trek 1500 with full Ultegra. I ride for fitness not comp. As I weigh 56kg I'm a weight weenie just by getting on the bike.
If I believe what the web says, the wheels I've got are pretty light already, so I'm not sure where I might look - but those quattros are pretty schmick.
Turning here for the usual gratuitous advice...