depending how much power you after?low end power or high end power, in your case next step will be cam, crower ,crane,JG make good non-vtec aftermarket cam (i was told by a mate in the forum that could get tomei cams for b18b as well, but was sure where)
Most popular one for B18B is crower, you will choose either 403 or 404, both of them need tetainer and valve spring. 403's power is for middle range and high end rpm without losing much lower end, with them is not necessay to increase your CR,however it will give you best gain if you increase CR.
404's power is for high end ,you will lose lower end power, but high end is great. with this cam you have to increase CR by putting CTR pistons or milling your head, arp head stud and bolts for the safety rev up past 8000.
Both cams need to be tuned with some ECU's like uberdata,hondata. while you are changing the cam , you need to also get aftermarket cam gear, valves,oversize throttle body ,intake manifold , p&p your head, bigger fuel injector ,fuel rail ,FPR, clutch ,flywheel ,pulleys,type r gear box with LSD.
Those are what i can think right now, for 403 with those you will get 155 to 165 whp.For 404, you will get 175 to 180 whp.