You've already done as much as you really can. Won't squeeze much power out of an N/A H23. Infact, I doubt other then the extra noise that you can notice any power increase.
If you want handling get sway bars and coilovers, I recommend the Buddyclub N+ I had them on my prelude and I'm actually looking at replacing my Tein Super Streets for them on my Civic.
The sway bars will increase your chassis stiffness like you wouldn't believe eliminates so much body roll and lets you really hug in around corners.
As mentioned before in the thread look at swapping in a H22A or if you really have the spare cash laying around a k24 with a k20 head like manolii suggested, but engine swaps are pretty exy if not done yourself, and can be pretty complex if you don't know what you're doing.
If you're looking at just pulling out a bit of extra power for relatively little cost on your current engine look into maybe a new camshaft + ecu chip like a hondata S100 maybe a S200, combine that with a good dyno tune and you'll be amazed at the difference.
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