Some of my favorites of the moment are John Mclaughlin[guitarist], THe Bad Plus[Hard Bop, Jazz Trio w/ Piano, bass, and drums], and Brad Mehldau[piano].
I think i've said this a million times and ill say it again, McLaughlin is one of the greatest, if not greatest, guitarists alive. He can do straight ahead jazz, hard bop, fusion, indian music, flamenco, basically anything, and he does it with unsurpassed technical ability and style. The Bad Plus is a really fun group that ive gotton into the past year. At times they can be totally chatoic, and at other times they'll play some of the most beautiful melodies. They also do incredibly interesting covers of works by Aphex Twin, Blondie, Black Sabbath, Nirvana and The Pixies. And Brad Mehldau, i dunno, he's just amazing. being a piano player myself i'm nothing short of impressed by his choice of notes and rhythms, definetly one of the most talented jazz pianists to surface in recent years.