Since you mentioned money, I'll add this. I'm all for another, better set of wheels, but only if you can salvage them for next to nothing. Several times in my cycling life I've been given excellent used wheels by friends who have upgraded much farther than I would ever do. I got an incredible deal on Craigslist once, too, very nice wheels for less than the cost of the Gatorskin tires that came with them. Keep your eyes and ears open.
I also agree that lighter wheels are of limited value while touring. I made it cross-continent, self-supported, on a set of light wheels, but I was a little nervous about it especially after replacing a broken spoke in Minnesota. I pushed the envelope on that one, just to see if I could.