Interesting question, Adam L!
(And, as an aside, it's 'Reform' Judaism, not 'Reformed.' The Reform is ongoing...common mistake!)
Question One: I'm a Jew--specifically a Conservative Jew.
Question Two: If I had to be another religion? That's not possible--there's no option to stop being Jewish. You can add another religion, but you can't take away Judaism
So I guess you're asking what's the religion that's next-closest to your heart. Hmmm...
Let's see...I could go so many different ways! I could be a really troublesome Catholic (I grok Catholicsm, even if I don't agree with it--I'd be chaining myself to the bishop's porch every week protesting something or other) a half-way decent Hindu (but I'd have issues) or a really decent Buddhist.
Final answer: Buddhist. And I'd belong to one of the interdenominational groups of Buddhists (i.e, not a specific vehicle.)
Question Three: If I had to choose a different branch of Judaism, I'd probably go Reform--but I'd look for a very 'Reformative' shul.
I could also go to BJ's--Congregation B'nai Jeshurun--in Manhattan. They used to be Conservative, but became independent because they were ahead of the curve in allowing gay marriages, rabbis, etc. (I suppose they might come back to the Conservative movement now, but I suspect they'll stay independent.) At any event, it's a wonderful synagogue with great music where people get up and dance down the aisles. And the services are very traditional, all in Hebrew, etc. I love it! But it's so close to Conservative that it probably doesn't count as a different branch
Orthodox would be tough--even without the gay issue, I'm pretty committed to egalitarianism. Reconstructionist would depend on the specific synagogue and community.
Final answer: Reform (with a very 'Reformative' feel.)
Question Four: It'd be hard for me to become an Orthodox Jew. Not impossible--if the only synagogue near me was Orthodox, I'd join and make do. I might have to convert again or I might not, depending on whether the shul would accept the beit din, mikvah, etc. from my Conservative synagogue.
(I once assumed that the gay issue would prevent me from converting in an Orthodox shul, but I've found out since that's not necessarily the case--it depends on the circumstances, rabbi, etc.)
But all that said, I'd find it tough to be Orthodox...again, because of the egalitarian issue. I respect the right of Orthodox communities not to have women rabbis, cantors, etc....but I'd like to be part of an egalitarian community.
I'd also have a hard time being a low-church Protestant. I can appreciate wonderful low-church, music-filled services...but I grok (and require) liturgies.
Jeez...all this has made me realize just how happy I am as a Conservative Jew!