Hondata is not a piggyback system. It's a "chipped" ECU that essentially lets you have it dyno tuned and burn another chip. Depending on the stage of ECU you get from them you either have to have a shop that sells Hondata tune it for you, or you can just go to a dyno and tune it yourself. Check out their website for more info. At the moment Hondata only modifies OBD-1 ('92-'95) ECUs so if you have a '96 or newer car that you'd like to put it in you'll need to convert your wiring over to OBD-1 which either costs a lot of money or takes way too much time. AEM also sells a replacement ECU but instead of burning a chip every time you want to change something with the program, you just download it from a PC to the ECU. Bit more expensive than the priciest Hondata option but it also offers the most tuning options. For an OBD-2 ('96-up) car though, the AEM setup becomes a better deal because AEM does indeed sell systems that are a direct plug-n-play with the OBD-2 wiring.

All B-series VTEC cams are interchangeable, so most of the companies out there (including skunk2) sell a few different stages of cams. Since you use a B-series VTEC head in making a CRVTEC, these will obviously fit. The Stage 2 skunk2 cams are some of the best out there.

A fully built up CRVTEC motor can easily put 220 hp to the wheels all-motor, so beyond that a turbo is just nuts--not to mention insanely expensive. How much cash you plan on dropping here? If you want a turbo CR-V I would suggest skipping out on the VTEC head and just get the turbo.