I primarily use my PSR s910 for trance and electro.

here are my favourites:

Ibiza 2002
Disco Teens
techno party
club beat 2
CHart R&B (from Tyros 2)
dream dance
euro trance

set the main drum kit to Analog T9.

for the multi pads use DanceMix 1

the best thintg about trance is u can easily make your own patterns and loops.

The S910 and T3 have awesome synth sounds and pad voices.

good luck!