The same computers as for any other bike, and the spoke count doesn't matter.
I have three computers -- an '00 Specialized Speed Zone Comp, an '01 Planet Bike Protege 9.0, and an '02 Cateye Tomo. They're all basic, wired comps, and I can't say I've had any problems with any of them. The Specialized is only on its second battery after 6000+ miles and frequent rain rides.
RichC
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Training: 2002 Fuji Roubaix Pro (105 triple)
Commuting/Daytripping: 2001 Airborne Carpe Diem (Ultegra/XTR, touring wheels)
Commuting/Touring: 2000 Novara Randonee (Sora/Tiagra/LX, fenders, lights)