If you're considering getting all the components separately and want a triple plus lower costs than 10 speed, then consider 10 speed Campag shifters (the front shifting isn't indexed so you have far more flexibility with chainsets and trimming front mechs) and 8 speed shimano at the rear. Campag 10 speed shifters are cheaper than shimano, have non-indexed shifting at the front and are directly compatible with shimano 8 speed at the rear which not only gives you a harder wearing drivetrain but also a cheaper one to replace!
These shifters are bargainous:
http://www.parker-international.co.uk/10705/Campagnolo-Veloce-10-Ultrashift-Ergo-Levers.html
Choose any old triple chainset but note that you'll need a campag triple front mech as the cable pull is different to shimano. At the back, just fit any 8 speed shimano long-cage rear mech and 8spd cassette and you'll be good to go (two clicks on the gear lever will be redundant but that makes no difference at all when limit screws are set properly).
Some great wheel offers here:
http://www.planet-x-warehouse.co.uk/acatalog/Shimano_Wheel_Offers.html
Long cage rear mech on sale (ignore the specs below - they're for the med/short cage version):
http://www.chainreactioncycles.com/Models.aspx?ModelID=13596
Alternatively the GS (med cage) Tiagra would also work fine:
http://www.chainreactioncycles.com/Models.aspx?ModelID=19461
Front mech not quite so widely available at a decent price but here's a couple of options:
http://www.parker-international.co.uk/7236/Campagnolo-Comp-10sp-Triple-Front-Mech.html
http://cgi.ebay.co.uk/Campagnolo-Ce...sure_cycling_bikeparts_SR?hash=item53de480c06
Cassettes are easy, although if you want anything more than a 12-26 as the largest sprocket then you'll have to fit an mtb rear mech to cope with say an 11-32. Any shimano MTB rear mech for 8/9 speed will work.
http://www.chainreactioncycles.com/Models.aspx?PartnerID=79&ModelID=1864