Personally I think 'Ableton Live' is you best bet... you can download a hacked version for free. Ableton comes with good instruments with it, and you can load a shit ton of vst's (free hacks)
you can control these intruments and samplers from your keypad (using your keypad as a keyboard)
All this free, while you build up a studio.... later add a midi controller, and a external sound interface.
reason 6 is cool, but is not as all-in-one like ableton is. Able can record, sample and produce all more streamlined in my opinion.