I'd recommend Scooter (duh (since I've used them b4)), they released a 2-Disc collection of their better recent stuff not too long ago, look for it. I'd also recommend Orbital for a bit of a twist on Techno. Darude is good for some faster, progressive beats. For something more along the lines of Trance, look up DJ's@Work (beautiful vocal trance stuff). I'd also recommend Plasmic Honey and D-Devils for a little darker flavour of Techno.