Usually you need high disk or at least mid for clearance of 4-piston calipers.
The disk just refers to the spoke design. High disk wheels bow outward from the center and give the smallest lips. This doesn't mean they necessarily look bad, though... I dunno about the SP1, but in Volk wheels, the high disk gives that nice concave spoke look.
In this case, you could've just looked up the "matching" chart. The suggested sizes won't give you the biggest lip and widest width, but they will tell you what disk you NEED to clear your calipers.
In this case, for the R32 GTS-t, S14 K's, and S15 Spec-R, which all use the same calipers as the US-spec Z32, they recommend the medium disk with 17" wheels. So the 17x9 +16 MD is probably a good pick for the front.
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