Royksopp is described on Wikipedia as “Downtempo” or “Trip Hop”. So you might like groups like Faithless (Dido’s old group), Massive Attack, Portishead, Zero 7 and some others. Although much of that music isn’t really danceable.
I have a terrible time organizing the electronic / dance music on my iPod by genre (House, Trance, Eurodance, Eurotrance, Progressive house, Acid house, whatever). So I’ll just throw some songs I like out there and you can decide.
I’ve found new music that I like (I tend to prefer trance but some of what is played probably fits what the OP is looking for) simply by listening to podcasts. I suggest Subterranean, Trance Around the World, Trance Tuesday, and Store N Forward.
Might also try Crystal Castles and Ratatat. Those aren’t so heavy on vocals-- in fact I think Ratatat lacks them completely-- but they’re inarguably bouncy and fun.
I’d recommend checking the playlist for WBER. The bottom of the page (Elektrobank Playlist) is updated with the latest that they’re playing, plus some older stuff as well. If you have digital TV, the Dance and Electronica channels are also a good source.