I dunno, personally I've been mixing sets lately that have started with precussive London stuff and then blended it out into funkier tech like the stuff Bang-On puts out which then blends seamlessly into tougher Hard Trance (Bang-On 9 Ring Ma Bell into Nick Sentience's rmx of Komodo comes to mind, the transition from one to the other is so seamless its scary). From there it usually moves between techy hard trance/house and london tech into some seriously screaming 303's which then moves into freeform, hardcore and gabba for the climax. Also oddly there's some really banging full on psy trance that mixes REALLY well with some of the stuff that's been coming out of London's hard dance scene also.

I dunno, I've found you can mix and match whatever genres you want as long as you find the right records and can make it sound good. All this talk of trance NEVER mixing into techno (or whatever genres you want to mix together) is just nonsense if ask me, there's just to much crossover in general between genres to rule out the possibility of mixing across them.