Your best source for cutting edge hip hop drum sounds is definately the internet.

I know for a fact that many of today's successful rap producers simply take their drum beats from either the internet or from sample CDs. I know this because on a few occassions I've downloaded drum loops and suddenly recognised the same stuff appearing on hit records.

Luckily, there is no shortage of great rap and hip hop drum loops out there so I'm sure you'll have no problems.