Dude, Forgotten Realms all the way!!! Although I'll admit that I've only read 2 Dragonlance novels. RA Salvatore is my fav. writer, period, not jus' in the Forgotten Realms either. He's best known for his character Drizzt Do'Urden, he's written the Icewind Dale Trilogy, Dark Elf Trilogy, Legacy of the Drow, etc. And I jus' ordered his latest novel, The Orc King, on-line and am gonna get it soon! I very excited right now. I love his writin' style, especially the way he describes the combat scenes. It's almost like he's paintin' them wit his words.
I dunno 'bout crossovers, though, it jus' seems like it would b way too complicated ta do such a thing.