Howe and Kotzen for sure, if you like their style in particular, check out Prashant Aswani.

Some other guitarists you might like:
Allan Holdsworth
Frank Gambale
Shawn Lane
Brett Garsed
Tony Macalpine (with CAB and Planet X)
Derryl Gabel

And if you like older fusion (70s), you of course would love guitar players like Al DiMeola and John McLaughlin.