screw the head package.. no sense redoing what you've already done. Stick with your cams and valve springs. I run 12's all motor with a 98 civic EX (yep, a SOHC).
All this for around the price of a turbo will get you 13's. PLUS, there's room for improvement later on:
Raise the compression up around 10.5 or 11:1, bore it out anywhere from 25 to 80 over, stay N/A and away from nos for now. The new pistons, go JE with their rings, pins, etc. Just have your old rods strengthened. (shotpeened)
Other things to consider:
AT least an ignition kit. $200. Get pulleys and a cam gear for around $240. High-flo fuel injectors, fuel rail, fuel pressure regulator, and fuel pump for a little over $500. Next, some kind of fuel management, either a piggy back like apexi for $350 or a full standalone cpu like aem's new one $1400.
Lastly, if you've got an auto tranny you're gonna need a torque converter.
I can get pretty good deals on whatever you need. From like 5-10%, and not that crappy quality you get from ebay. Straight from the manufacturer too.