There are threads upon threads of wheels that will actually fit your car. The Focus uses a not too super common bolt pattern of 4x108, but any factory wheels from a 00-11 Focus (including SVT) or newer Fiesta will fit. You can also check tirerack.com for wheels and tires that will fit your car. If you're willing to shell out a little more dough, Perfect Circle Autosports imports Team Dynamics wheels from the UK, which can be custom ordered in any bolt pattern or offset.
As for suspension (especially in an 06/07) go with the Ford Racing kit. It's what I have on my car and it's definitely how it should have been from the factory. The drop isn't too crazy and they're better than Eibach Pro-Kit springs, which provide a similar amount of lowering but are too soft in my opinion.
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