Mortplayer is hands down the best Music Player out there, especially with skin support and freeware. For video, try TCPMP. Best video software and with YouTube support as well.

I purchased Coreplayer because I wanted to support the developers and for the use of TCPMP for years. However, I've been so disappointed with the software and find myself using TCPMP more and more. The worst part, the skins document has been out for sometime and I don't see anyone posting new skins. It's probaly too hard for even skinners to follow or the software is being bought but not used (like myself).