Be aware that a triple crankset will require a different front derailleur and possible a different rear derailleur with a mid length or long cage, so figure that into the budget.
Campagnolo also made several flavors of square taper compact doubles, which would get you a 34 small ring, and help alot. They can be run with a standard double front derailleur.
The compacts pop up on Ebay occasionally, be prepared to jump on one if you find it.
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My bikes: '81 Trek 957, '83 Trek 720, '85 Trek 500, '85 Trek 770, '81 Merckx, '85 Centurion Cinelli, '85 Raleigh Portage, '92 RB-2, '09 Bianchi