Well you definitely don't need an MPC to get started. IMO, if you enjoy recording on your PC, then go for it! I personally prefer recording on my computer, rather than buying all kinds of gear.
Having hardware gear has many advantages, but if you're just starting out, then there's nothing wrong with recording just on your PC. There's so many pieces of software out there that will give you the same or almost the same results as hardware.
It's all a matter of preference, really. I started off with small gear, then went up to a computer, then slowly started adding small pieces here and there.
As for Reason and Recycle, I haven't used them yet but I know that they're both off the hook. With those 2 and Sonar, man, you can do some serious damage.