I went with the WU-08 kit mainly because I didn't want the 1.5"+ wider track width that comes with the 07 kit. I didn't realize about the 07's wider track-width until after I purchased the 07 kit (Blaine popped my brain when he educated me on that...amongst other things).
The center bore for 5x5.5" Mickey Thompson Classic IIIs will clear the 08 kit as will Pro Comp's classic III equivalent aluminum wheels. FWIW, I haven't seen a single 5x5.5" 15" steel wheel option work for the 08 kit (center bore is always too small).
I had issues receiving my back-ordered MT wheels and didn't like the chalky-gray look of the Pro Comp's, so I went with Method Racing "304 double standards." I don't love the wheels by any means but they do the job.
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While my shimmy at highway speeds with 5.38s isn't nearly as bad as Chris's shimmy with 4.88s (luck of the draw), I'm still super happy that I went with this kit because highway driving feels like I'm riding on rails (it's very pleasing compared to the alternative).