hondata is worth the $, but for most basic to mid level builds get the obd0-1 conversion harness from www.boomslang.us (never see one of his fail) it's plug and play. obd1 distributor (you'll have to rewire the plug or see if boomslang will make you one...he doesn't advertise them anymore, but i think he can make one). a chipped obd1 ecu and/or tuning. you'll need all that to run hondata anyway. w/o hondata you're looking @ somewhere in the $400-500 range and add $200-500 if you wish to add hondata, but it's not 100% necessary.

feel free to pm/call me if you have any questions.