Hi Jordo,
Welcome to GT........Seymour Duncan makes some wonderful replacement pickups...the "pearly gates", "59's" or "seth lover" models will beef up your tone.........the amp you're using is also important....and it is the consensus of many players that 70% of a players tone is in his/her fingers. Take care and all the best Jordo.
Doug
Here's a link for you:
http://www.musiciansfriend.com/navigation?q=seymour+duncan+pick+ups