Bottom Bracket

Tiltzey
Tiltzey Posts: 8
edited April 2011 in Workshop
Hi all!
Got a Giant Defy 3, less than a year old, and the bottom bracket's knackered already!!
Quite new to cycling and bike maintenance but not worried about getting stuck in to the repairs, so:

I'm looking to replace the BB but haven't got a clue what to go with, the current spec claims the BB fitted is the FSA Mega Exo External with a FSA Omega MegaExo crankset.

What should I replace it with? Shimano? What's compatible?

HELLLLLLPPPPP!?!?!?!? :P