you need to be very careful with floyd guitars- some of the licensed copies just plain suck, and won't hold tune.
That being said, some of the copies are very good, if not better than original floyd roses- things like ibanez edge (not edge III) and schallers.
for cheap, the best guitars with a decent floyd are, IMO:
ibanez s470- it has a zr trem, it's a floyd on ball bearings. It's about £340.
ibanez rg1570: it has an edge pro. It's prestige. £460 odd.
Schecter C1 FR: has an original floyd, and coil taps/splits. £400
Washburn x40pro: has a schaller floyd, and duncan custom custom/'59. £450?
That's all i can think of offhand.
IMO, all those pickups could do with being changed, but obviously the washburn has real duncans, so they should be a bit better. However, even the duncans won't compare to BK's, IMO (and pretty much anyone on the boards, i'd guess), and if I were to get that guitar, i'd switch them for something better...