You can get a slightly wider front tire with no mods... Metz 880 makes a 90/90-21 front tire (and a 200/70-15 for the rear) that fills out the fender nicely, but I never had any handling issues even with the stock tires on, so no worries there.
The debaffle is amazingly easy to do as well, to give ya some rumble without dropping a few hundred on pipes. As for the rest of the mods that can be done, the sky is the limit. Hit the 900 pics thread here, and you'll see a world of options!
BTW, welcome to the forums!
BACA Pretzel - Flyin' the highways in OK!
'08 Vulcan 1600 Nomad - "Grace"
Metallic Diablo Black/Candy Fire Red
Vance and Hines Duals
Kuryakyn Flame grips with Throttle Boss and Stiletto endcaps
Kuryakyn Longhorn offset highway pegs
Vista throttle lock
OEM light bar and luggage rack
B.A.C.A. Member, Oklahoma Chapter
Out to pasture - 2008 Vulcan 900 Custom: Redemption