I'm a beginner looking for a decent keyboard that isn't TOO expensive (under $300 US). I want it to be portable, decent sounding and have at least 61 keys. I want to use it away from the computer but I'd also like MIDI capabilities for when I get comfortable enough to lay down piano/synth tracks in my home recorded music. What are some decent brand names to shop for? I've heard Yamaha and Roland are good. I'd probably go for one of the M-Audio MIDI keyboards except that I want stand-alone capabilities so I can jam at a friend's house with it (he doesn't have a computer). Can you offer up a few specific models? Thanks!