Food. Like a meat and cheese basket. Or, if you know he's into sweets, a cookie/candy/chocolate basket. As long as he's not allergic to anything, I think food is always a safe bet for guys.
Also, for next year, I would suggest creating a little questionaire that everyone fills out - favorites of various things (drinks, candy, thing to collect, smell/candle, sport, television show, movie, hobby, etc.).
We did this at my last job and turned it into a week of Secret Santa - no spending limit, though. Most people didn't want to spend a boatload, though, so found ways to keep it simple - a six pack of soda one day, a couple of boxes (or whatever) of their favorite candy the next, a small candle in their favorite smell, a small notepad with their favorite quote or disney character or whatever... then at the final secret santa (with a potluck lunch) was a bigger gift - a DVD season of their favorite tv show, a cd of their favorite musical artist/group, a decoration for their home, etc.