I want to buy a keyboard, and after playing guitar, bass and drums for a few years, i thought i could try it out and expand my musical abilities.

I am stuck between either buying a midi controller or a portable keyboard (I'm into learning alot of the 80s type keyboard songs like jump by van halen lol).

I'm deciding between: M-Audio Oxygen 49 midi controller
Casio CTK-3000 Keyboard 61 keys

I have some midi software on my computer from a mixer i bought awhile ago (hypersonic 2), and i was wondering if the Casio CTK-3000 could be used as a midi controller since it has usb? If it can't, then I still am stuck in what to choose, because it'll be my first keyboard that i would like to learn on.
not really too helpful here, but i say just get the cheapest one you can find to see if you like it
Roses are red
Voilets are blue
The only bulge in my pocket is my wallet
No i'm not happy to see you