JAKE GYLENHAAL.
Lucas Grabeel
Christian Bale
Heath Ledger
Adam Brody
Adamo Ruggiero
as for obscure, Adamo Ruggiero kinda is, cuz not that many people know who he is. (He plays Marco on Degrassi.

)
and before Batman Begins came out, Christian Bale was semi-obscure. But I don't necessarily like him in BB. My crush on him started when I say Newsies.

A 17 year old Christian Bale singing and dancing? YUMMY. You could say that for the rest of the cast of Newsies as well. hehe
and I also have my Broadway crushes:
Adam Pascal (Roger in Rent)
John Tartaglia (Princeton/Rod in Avenue Q)
Barrett Foa (replacement for ^^ in Avenue Q)
Aaron Lohr (Mush in Newsies, "Will I" soloist in the Rent movie)
Hugh Jackman (yes, he's a celebirty, but also Broadway!)
Micheal Arden (Peter in Bare: a pop opera)
Aaron Lazar (Enjorlas in the Les Miserables revival)
John Hill (Jason in Bare: a pop opera, Link understudy in Hairspray)