I used to be a user of both Finale 2006 and FL Studio 5, but neither program suits my needs. I love the notation of Finale, but I'm limited to the Garritan Personal Orchestra or cheap MIDI noise unless I want to dish out even more money. FL Studio supports SoundFonts, but I really don't like loop-based composition and the limitation on the use of time signatures, and I'm not a fan of piano roll either.
I'm looking for a program that supports standard music notation and guitar tabs, and also supports SoundFonts. The cheaper, the better.