Not much I can add that hasn't already been said. By the time you break a third spoke, all the spokes on that wheel should be considered suspect. If the rim's still in decent shape a relacing with quality spokes may be enough. Probably little difference in price between an LBS doing it and outfitting yourself, if you're so inclined. If buying a new rim in addition to spokes, I would opt to increase spoke count to 32 or 36 and include a new hub as well.
What more would you like to know from the collective Clyde brain trust?
__________________
Birth Certificate, Passport, Marriage License Driver's License and Residency Permit all say I'm a Fred. I guess there's no denying it.