You can still make good power with a D16, trust me. It has power potential very close to the B16. The Skunk2 manifold is around $300, if you're willing to pay that for a small power gain... if you can get it, and I'm not 100% sure that it's even available yet. You can use a D16Y8 manifold. It came on the 96-00 EX Civics, and is the best flowing out of the OEM D block intake manifolds. You should be able to find one at a junkyard fairly cheap.
If you add an Integra throttle body, make sure you match port the intake manifold to it. You don't want a hard step between the IM and the TB.