Let's see...
Jonathan Lethem, though I've only read "The Fortress Of Solitude" but it's an amazing novel and I plan to read everything he's published. (Hmm, I see now that he debuted in '94, but what the hell.)
There have been a couple of debuts over the last few years that I enjoyed a lot if not enough to call them masterpieces, but which could go either way in the future - Shteyngart, Safran Foer, Martel... but I'll certainly keep my eyes peeled.
Also, I recently read Helen Oyeyemi's "The Icarus Girl". Considering she was still a teenager when she wrote it, it's tremendous. Give her a couple of novels to hone her craft and she might be a great writer.
One very hyped writer who disappointed me was DBC Pierre and "Vernon God Little". "Catcher In The Rye", MTV Stylee, now with extra "****"s. Not awful, but... Pulitzer prize?!?