I'm an independent voter, and I voted for Obama in 2012, but Hillary is a nauseating candidate.
I'm unaffiliated as well, and I voted for Obama in 2008 and Romney in 2012. I sometimes change my registration to either Republican or Democrat for primary voting, then change it back to unaffiliated afterward. (PA has closed primaries, also a three-week advance deadline.) I'm thinking I may vote in either the Dem or GOP primary, but I haven't decided yet.
I agree with you about Clinton. I also don't care for Trump. I really hope we don't end up with Trump vs. Clinton for a general election choice. I've voted for other party candidates before both for president and governor, but it's much more satisfying to vote for either a D or R because that's where the power lies, so I really hope one of those two parties gets its head out of its ass before the convention. If it starts to look like my vote could make a difference for either party, then I'll change to that party three weeks before the PA primary and vote in that party's primary. Sanders doesn't really give me a raging hard-on, but I think he has better judgment than Clinton, and seems more trustworthy. The GOP seems like the more interesting game this time in the sense that I have a hard time believing a majority of Republicans nominate Trump, but the others seem very weak at this point.