Currently, I am in an accelerated ADN program since, while EXORBITANTLY expensive, it is easier to get admitted than the local community college with its astronomical requirements and millenia long wait lists. I do plan on doing an ADN-BSN bridge not long after, since it seems that the industry is trending toward preferring BSN RNs. My ultimate goal is an MSN... but who knows if that will happen... I am taking one day at a time.
Keep in mind that RN and MD are two *very* different levels of education and responsibility, and in my humble opinion, being an RN gives you a mere taste of what it is like to be an MD - a VERY small taste. So if you think you'd prefer to be an MD, I would start looking at your options *now* - it is not cheap, requires many more classes and years of experience, and then you have to fight like hell to get accepted.
Whichever path you choose only you can decide - and I wish you nothing but the best no matter which you decide! Good luck to you!