I hope that plenty of people will stick to casting the protest votes they probably want to. There's a chance to hammer the crap out of the main parties and maybe that'll knock some sense into them.
OK, having stopped dreaming... I honestly don't know who I want to win. After all the shouting about it and with a high chance of the SNP backing up their poll ratings to win huge numbers of seats, I fear a Tory majority will lack any kind of legitimacy and would just drive Scotland and England further apart -- if the Union is thus "saved", it would only be temporary. On the other hand, if the SNP have any role in a coalition/ confidence-and-supply arrangement then the price for their support is sure to be pretty steep.
Essentially this means that either Lab-Lib or just outright Labour Majority are the best ways to save the Union, at least in the sense of keeping England and Scotland together... but then there may be other consequences to that too.
I think I'm hoping for a Lab-Lib coalition. Maybe. I'm not sure it will happen, though. My expected result is either Labour minority, or a second election within a year.