I would be most in support of Cain, simply for the fact that he actually has been a successful businessman, and not a career politician - which is a big selling point for me, so to speak.
Knowing he has, sadly, no chance in hell of actually being voted for GOP candidate, nor for president even if he did (sorry, just being realistic): I think I like Paul over Romney.
Though Romney actually seems a good candidate in terms of position (in support of ObamaCare repeal, in support of large and long-term health-care overhaul, in support of SS reform, pro-gun ownership -but within reason-, etc.), I can't look past his opinions on a few factors that would directly impact me -such as his position on national recognition of same-sex marriage (deadset opposed) and domestic partnerships. But I admit, he at least acknowledges state priority in the decision.
Paul seems to support much the same aspects that I agree with. While furthering that by actually claiming government should be out of marriage entirely, which is a bit of a co-out, most likely...
The rest of the candidates I am rather opposed to, to be honest.
To be to the point though, I don't vote by party lines anyway, so the GOP vs. Dem thing really just confounds me. I don't see why they even bother with it...the candidates seem so very similar in so many ways - with only a few small, only vaguely differing issues ("hot button" topics like gay marriage and gun control). While the while only pandering to the moderates with promises of "tax cuts" or "tax reform" or blah blah blah. They all end up doing the same things in the end: raising the national debt, claiming they want it lowered while not cutting spending in any real way, and then claiming it was the other party's fault when people point it out.