Matt-
Both topwater and Salmo g. made great points. My favorite multi-tips are the ones that I built to suit my exact needs.

BUT, if you do not feel like going through all the trouble, for $45, any Rio dealer can sell you just the body section of any weight Versi-tip.

Considering you already have the tips, you have need to buy a whole nother system.

Also, Rio's loops are the only ones I have full faith in (aside from my own). Airflo's are great but they have broke in the past and the SA and Cortland tips are not as clean or stiff as Rio's.