Nishikori, mostly because he's Japanese but he seems like a cool guy.
Kohlschreiber
Baghdatis
I like Gilles Simon a bit, but not that much.
Used to be a big fan of Berdych and Soderling because I loved the big hitting. But lately not so much, mainly because Soderling has been inactive and perhaps Berdych's arrogance got to me. (or maybe I just got bored of the ball bashing, who knows?)
ETA: Oh and I really like Del Potro, but I didn't think of including him since he's already won a slam and is pretty much well liked in general.