Well, you'd need a job at 30 to get summoner... and it takes alot of work, that one. That basically means that you need a Sub to help you get to 30 before you can consider SMN. WHM would give you far more MP than RDM, and being used as a backup healer in a pinch makes you *quite* valuable, and noone could really expect you to be a main healer having half level cures compared to a full out WHM, but if you really want to limit your options for getting into PTs...
then...
Looks like you've made your own decision already, RDM for you... which means you'll still have the occasional emergency cure to perform, but not nearly as often![]()