hi thedelbwa, my mate got me a solid silver keyring from tiffany's for my 30th, with an engraved message - I am a female so maybe that would be a bit girly but maybe they do stuff for men too? it's really gorgeous and something to remeber it forever. they do have a website were you can order stuff and i'm sure the'll have something for �50-60.
think about his interests / hobbies - come up with a theme. maybe a day at the races/driving.
also, www.moonpig.co.uk do some great personalised birthday cards.
good luck.