Evenin'
OK, good stuff, although some issues with sound quality, due to the Flash streamer you have on your site? Didn't download them so I can't check
Promosong83 has a good electro vibe to it, sounds very commerical. Slap a big vocal hook on it and you've got a monster there. Are you running any sidechaining on the lower freqs of the lead? Will help give the kick a much crisper sound. Also, the snaredrum feels far too solid and crisp for the track, perhaps another sample that's a bit more "floaty" or some 'verb/delay will help soften it out and stop it from dominating the mix so much.
The first one, quite spacey in feel. Feel like the higher freqs need pushing out a bit more, especially the hats. Smack some stereo separation on them too, gives them more space. Really not a fan of the progression, also it lacks a fair bit of drive and the direction of the track as a whole seems a bit disjointed. As a whole, with a bit more oomph it'd be great.
I like your work on the effects and your percussion work, also you seem to know what sort of sounds to use when and where, which is massively important.
S14, that's turntablism, beatmixing (which most people know as "DJing") is a whole other world. Best start with the crab and skibble scratches now fella