If its just MIDI you want to record (i.e. control your setup and play your soft synths with the dedicated keyboard controller) then all you really need is a MIDI keyboard. Nowadays MIDI transmits via both MIDi cables and USB/Firewire.
So if you're after a MIDI controller keyboard then a trip to your local music store should help you find what you need. If you want recommendations then I personally like CME stuff. Dirt cheap, feels good and comes with plenty of external controls that you can assign to anything.
The only thing that confused me about your post was you mentioning built-in speakers. If it's just MIDI you want then wy would you need them? You already have speakers don't you?
cheers,
EDIT
Oops... wrong icon for the post again. My bad.
[This message has been edited by 3351 (edited 01-13-2008).]