There are so many kinds of techno, asking for some good techno is like asking for some good rock. That could mean anything from Buddy Holly to Pantera. House, trance, jungle, breaks, and ambient all have massive amounts of sub genres to explore so it depends on your tastes.
I'll reccomend some sweet trance though. Paul Van Dyk, Armin Van Buuren, and Tiesto are really big names as far as general popular trance goes. GOA and psy trance are my personal favorites. Check out Infected Mushroom, Astral Projection, Shpongle, Hallucinogen, and Analog Pussy. I like listening to local dj's since those are the guys that I see spinning at the parties (raves) i go to. Here.
http://www.rave.ca/music.php?redirect=2241
http://phonolite.ca/br34th3/demo/2005_summer.mp3
I really hope those two links work, I've seen both of those guys play in Montreal. They're great guys and real chill too.