MMO's: Getting back into it.. but there's too much choice?!

Once again, I'm feeling that unmistakable itch within the gaming cortex of my brain (yes, ofcourse it exists..). The itch that continually nags at me to start playing an MMO again, until the inevitable happens and I give in.

My one problem? Which one do I choose? Do I do the unthinkable and re-subscribe to WoW (maybe not). Perhaps Rift, but then again, with the new Star Trek film that has just come out, I also feel drawn to a dabble in Star Trek Online.

This is amongst many other options I could take. Is there just too much choice these days? If so, is this nessacerily a bad thing?

One thing is decided though, I may as well not go back to Rift until the free to play model is put in place in June.