I think you'll get a lot more info at the Aximsite forums...

http://www.aximsite.com/boards/x50-x51-forums/

As for the "best", I'm not so sure. Having had many, HP has pretty nice build quailty, better battery life, better screen, etc. The X50v and X51v just gave a lot of bang for the buck and included the Intel video which gave it video horsepower. To do what it sounds like you want, you will need additional software. Starting with Coreplayer or TCPMP for video. That is an excellent program.