The 'thane S9 uses isn't of the greatest quality. When you're pushing on flats, they are noticibly slower. There are a shit-ton of wheels out there, but I don't know it all. However, some of the more popular ones that work well are Earthwing Superballs, in 66mm or 76 if you're gonna use risers, 70mm Retro Zig Zags. I'd recommend those two if it's going to be a more carving type set up, just because the square lips offer alot of grip, as opposed to something like Flywheels, which have radiused lips, which makes it easier to drift.
When you look at the Zig Zags, look at the limes or lemons. Limes for more grip, lemons for more drift, so to speak. And a note for the Superballs, they're rated as 82a, but feel more like 78a-ish duro wheels.