Conundrum

As many of my close friends know I will be finishing up with my M.S. in Comparative and Experimental Medicine very soon. I want a Ph.D., and I have a very sound idea for a reseach project that would provide ample material to do this. My problem is that I am now in a lab that, although there may be interest in what I want to do, my current mentor will be of very little help for my proposed project as he has no experience with genetics or molecular biology. The other programs around UT that deal with genetics and molecular bio have little or no interest, or experience with inflammation. Further, during my time in my current lab I have felt fairly unappreciated for most of my 2.5 years here, on top of this I am currently working in a vacuum as I am the only grad student here (in fact I am the only other person in the lab besides my mentor). So what do I do?
My choices as I see them are to either A) drop my ambitions of the research that I want to do for the next 3-5 years while I work on my PhD in another lab/program and hope that no one else gets the same idea I had, or B) Stay in the same program that I have been in and work towards my PhD with the same problems of not having any sort of guidance or support aside from the limited amount that my current mentor can supply.
The likelyhood of the project that I have recently proposed still being novel and cutting edge in 3-5 years is slim to none. The probability of me learning much more where I am now (not to mention being able to really get done what I want to do) is about as bright.
Anybody have any ideas? Another option?