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Exposure are certainly 'nicer' - well built, with plenty of interesting features, like additional external battery packs, piggy back lights, accelerometer-controlled brightness in some cases, and the Strada has a great road beam. But they're a lot of money to spend on a backup light, and the Moon lights are well put together.
Meteor Pro would be my first choice. £75 from Tredz. Almost double the output of the Joystick, and a pretty hefty battery. Few people on the local mtb shop rides have them, they're impressive for the money.
Some absurdly bright Moon lights available for that budget.