Yes you can get just about any off set wheel size you could need. Factory off set is 3/2. 3" on the inside 2" on the outside for a grand total of a 5" wide front rim. You can also flip the factory wheels if you want to install a flush valve stem. That way when its on the inside of the rim it doesn't hit or get tore off by the brake caliper. They are not real handy for filling tires up but you could always drill a new hole on the new outside part and install a regular valve stem. Then you would just be using the flush mount valve stem to plug the hole.
The down side to adding width outside of the spindle is it gives rocks, roots, and ruts more leverage back on your steering system. Much like using a long piece of pipe on a wrench / breaker bar on a tight bolt. This will increase the force required to turn the bars, and also give you stronger jolts back in on the bars when you hit bumps, ruts, roots, and rocks. This is called bump steer. This is why you see a lot of racers use a 4/1 off set wheel. It puts more tire on the inside so there is less leverage on the steering system. Then they usually make up the extra narrow width with 3+ a arms instead of +2's.
In my opinion the best cheapest way to gain width would be a wideing kit. It bolts on to the factory suspension mounts and moves all the new mounting points farther out. If your dead set on only going +1 and buying new wheels you could also take advantage of the 4/1 off set and get a +2" wide kit then bring the width down to a +1 by using the 4/1 off set wheel.
2003 Limited Edition Raptor
Kenz 720cc 11:1 stroker, +1 valves, Mega Cycle X-4 Cam, Sparks 6x Big Core, Keihin 35mm FCR's. 158 mains, 52 pilots, fuel screws 2 turns out.
F.A.S.T. Dune Ported 4mill, CPI Inframes, Keihin PWK33's, Direct Drive Lockup. 158 mians, CEL needles second clip, #48 pilots, air scews 2.0 turns out.