I voted Green.
The whole UKIP landslide thing needs to be put in perspective, especially in relation to the local elections where their vote share actually dropped from 23% to 17%, they were just better organised in motivating individual seats.
In the EU elections, they are the only mainstream party who are unequivacably anti-EU. The Tories are generally anti-EU but they're far more pro-status quo, Labour have... well, let's be honest, they haven't articulated their Europe platform, LibDems are fiercely pro-EU and anti-referendum, the Greens are pro-EU but also Pro-referendum.