My humble, experience-based advice to what's already been offered:
David & Glen are perfect references, both from the Middle Eastern finger drumming tradition. That's my specialty - I would highly recommend getting a Riqq and Karim Nagi's DVD (google it). Nothing will develop your finger strength and control like the Riqq, and it's a wonderful "analog" backup in a worst case scenario. Be careful, though. Riqqs are addictive and expensive. Get a good one (It's much cheaper to get a good one first rather than go the long route and first buy several cheap and crappy ones). Get a Cooperman [http://www.cooperman.com/coopermanriq.php], and then when you're good and rich, get a Kevork. Darbuka is a good second choice...same advice on these.