Do You Have Any Idea For A Musical Keyboard(USB/MIDI)

Have anybody got some kinda idea about a musical keyboard with MIDI or USB or any kind of interface.

No matter if it's PIC based, AVR based or any other kind of stuffs....
No matter if it's hard or easy to do...

DOn't need to be too much professional, ain't no need to look cute.......
I just want it for my home audio recording......cause I don't have enough money to get a real one...

So if somebody have any clue/hint links please share with me...

My plan if I use a fast 12bit ADC then input to a microcontroller for the interrace.......it may be done.........but it's still confusing and cloudy to me....

so again::So if somebody have any clue/hint links please share with me...

**broken link removed**

I think I paid $150-200 for mine - can probably find 'em even cheaper used. Seems like a better way to go than making one, since youd need to find all the keys/buttons, make them pressure/velocity sensitive, etc.