Keyboard question

So I am getting into the production game and have the following:
-laptop with 1.5 gigs of ram with Reason 3.0, Acid Pro, FL5, Sound Forge 5
-MPC 2000xl
-2 Technic 1200's
-Pioneer DJM707 DJ mixer
-Yamaha EXM66 Powered mixer/amp
-2 yamaha MR12 speakers (300 watts each)

I am looking at getting a keyboard but I am a little confused with MIDI and i have searched like crazy....
SO from what I have read I will need a MIDI controller (which is a keyboard with no sounds built in and all it does is sends MIDI info to the MPC or whatever it is hooked up to)...ANd then dont I need something to generate sounds for the keyboard to use such as a proteus or something?

I'm kinda confused because I'm used to older keyboards that had built in sounds and everything all in one.
Do they make a MIDI keyboard where everything is in the keyboard and you could just hook up that device to a cpu or MPC, or do I have to buy a MIDI controller like the radium 49 and then a sound module like the proteus?

THANKS!

the advantage of havin a mid keyboard is u can add sound modules over time...which take up less space and some have less features usually missin the sequencer, sampler but u have that already wit the MPC so u dont need it

im assuming i can get a midi controller and just have it to use with the sound modules built into reason 3???so i wouldnt need proteus or anything like that since id use the sounds from reason.

- im assuming i can get a midi controller and just have it to use with the sound modules built into reason 3???so i wouldnt need proteus or anything like that since id use the sounds from reason.

tru.