I believe you're looking for Eurodance, basically poppy tunes over progressive trance beats. Just search for that and you'll find 1000s of bands. Order from amazon.uk or something or pirate if you prefer that. There's probably plenty of websites with eurodance mixes, which should be perfect for your purpose (background music while driving). A few years ago there was this really cheesy act with dancy songs full of sexual lyrics using the same cast of characters over and over but I can't remember their name.
Damn, old thread. I guess you found what you were looking for.