There is nothing plain about the Triton Classic.. runs the same operating system as the Studio and the same Sounds.
it is everything you need in one box (Synth Sequencer,Sampler),
but from what i know the Pro Hiphop Producers use MPC's for making there beats.
in the Triton you programe your beats in the Arpeggiator and it isnt very flexible from the screen, i do my sequencing from Cubase on the comp, its alot less complicated.
if i were you i wouldnt go rushing out buying loads of stuff.
get used to the triton first , ive had myn for over a year and im still learning new stuff, dont buy to much equipment at one time it will mess with your brain,
the tritons manuals were made for rocket scientists so you may find yourself scratching your head quite a bit
the studio has 7 expansion slots and a bit more flexibility for sampling and the classic has 3, from what i understand the LE has none
you dont need 7 slots unless you want all the classical music style boards
heres a web site for you
www.tritonhaven.com a forum here completley dedicated to the tritons.
if you get a classic you could save your self a fair bit of money and put it towards a MPC if you still want one at a later date.
Good Luck - hope you make the right choice