Find out what the ERD of CXP-33 rims are and find an affordable replacement with the same ERD...detension the wheel, tape the new rim to the wheel and move the spokes and nipples to the new rim 1 by 1. Tension, true, and dish the new wheel and get out there and ride. That will be the least expensive way to get these built up. Also, your original description of the worn grove in the rim was not very descriptive but your last post made it very clear that it might be a good time to shop for a replacement rim. Unless there are significant issues with the spokes, such as corrosion, or they are breaking while riding, go ahead an reuse them....to make getting these out on the road a bit less costly. Should you find you are having spoke issues later you can start saving up some cash to rebuild with new spokes.
Don't feel too bad about what you spent on the wheels...if the bearings are smooth then you got a great set of hubs that should outlive your needs and you also got a bit of an education about caveat emptor that will serve you well with other internet and non-internet purchases in the future.
Cheers,
-j