OK, here I go again everyone. I just looked at the price of those SP C4s. If you're in that price range, I strongly urge you to go with
Line Audio CM3. They are much higher quality mics than the SP mics, and you really would need to move up to Schoeps, DPA, Gefell, etc. for a more refined sound. Under $300 shipped from NoHypeAudio in Belgium (no, you can't purchase in the US but the transaction with this dealer is flawless as many can attest).
Follow the Team Line Audio link in my signature for full info, many samples, and ordering info. If anyone thinks I'm just being a fanboy or exaggerating their quality, check out the first link there for a shootout with the Schoeps equivalent, the MK21.