I spent a bit, could have easily spent a shite load more!! Personally, for me, I am only newish to the whole DJ scene so my mixing skills are still in need of improvement, so I try to do a bit of a mix of both...Sometimes gets a bit hard to mix songs like YMCA into Black Eyed Peas...Also depends on your gig if people are interested in hearing that kinda music, then they probably aren't to interested in hearing your mixing skills. I'd be fading out one song and just hit play on the next. theres also stuff out there like 'the grease megamix' (amongst others) that go for a while, and people enjoy it. just a thought.