Whew - still, lots of choices.
Look into the Roland Fantom - $1700(on sale) great sound, action, arpeggiators, disk drive, 76 keys - super board. takes exp cards too.
I'm not much good with hip-hop, but the Triton has been a fav with those cats since it came out. Time to play one, don't you think ? Try the Fantom too, and the Korg Karma. They are all in your price range.