Ableton or Cubase, simply because they are used widely and therefore you will find better info on using it and help when you get stuck
Cubase is an excellent place to start because it will give you a fair idea how a hardware studio works aswell, Ableton has a diffrent way of doing things, which imo is more future proof, i dont think that linear mode production will last more than the next 5-10years (for many reasons), the live possibilities of Ableton are massivly exciting to me, although dont worry about that atm as your just starting out
Reason has a great sound, and so does FruityLoops, when they are used properly, but at the end of the day, it ALL comes down to how much effort and love you put into your music, without that, you might aswell buy yourself a set of saucepans and fart down a pipe
You can get Ableton Live Lite for peanuts