Geeky. It should be a term of affection, not of derision, haven't you watched The Big Bang Theory?
And geeky almost invariably means male. Go to any geek-related website, and the catch-all term includes the whole gamut of non-cool topics, including wargames, computer games, comics, toys and the like, and you will discover a world of choice for the man in your life.
Yes even the über cool, urban chic metrosexual you think you know so well will go weak at the knees once he learns that in 2011, finally, you can buy a Ghostbusters proton pack backpack.
But don't despair, it's not him, its a man thing!
And geeky can often mean relatively inexpensive, unless you have your eyes on a batman first edition immaculately preserved in a cellophane, airtight cocoon, of course.
Maybe a superhero themed skin for his Android smartphone would be enough to tick his geek boxes sufficiently.
Otherwise there are all manner of toys, bugs, wind-up monsters and office siege engines that will keep him happy without breaking the bank.
So if he dreams all day of owning an LED illuminated umbrella and gazing up at the Tyrell Corporation there is an answer, and if you are not prepared to surf too...