I personally wouldn't bother with those Apexi NEO's, SAFC and all the other rice boxes. You can do some resistor work (if you know your electronics) and imitate exactly what the SAFC does and pay 1/50th the price.

You won't get any real gains from leaning out the AFR. You need to work on the timing, the most you can do is advance the distributor although that's advancing the whole map x degree's, which can be dangerous.

Having said that, if you're tuning for economy, you can do it using the SAFC, etc.

Hondata can give improvements, they can tune fuel and ignition maps seperate rather than rely on advancing the base timing to compensate for lack of such control.

Hope that helps.