Wheel spacers aren't really a good way to widen a quad when you're doing it mainly for performance. For a 4x4 that needs extra clearance for bigger tires they're fine, but for a sport quad they really mess with the front suspension.
The rear axle isn't really a big deal with spacers, but for the same price G-force actually makes extended hubs which is lighter and more solid than spacers. But spacers on the front gives you some noticable bump steer (rocks and roots want to rip the handlebars away from you), and they make it easier to break tie rod ends, accelerate wear on wheel bearings and ball joints, and soften up the front shocks. So weigh your advantages and disadvantages here, and think about if it's really worth the trouble for a couple extra inches in width.
If you're really hellbent on widening the front end without spending the money for a-arms and shocks, one of the diamond J kits is probably the best way to go (which is hard for me to say, because personally I think these kits are a half-assed way of widening a quad.) At least they make an attempt at retaining the stock suspension geometry so you're not putting a bunch of stress on the bearings, ball joints, and tie rod ends, and in theory it shouldn't add any leverage to the shocks either.
