EFI V2 $800 you usually gety a tune or two witht the purchase of the V2.
I'm not sure a DSP switch (multiple tune selector) I know Guy is selling them at SoCal. As for additional tunes it depends on the tuner, I have seen people charge anywhere from 50 bucks to 350 bucks a tune. It really depends on what kinda of tune it is and who does it. I used Mcrats race tuine in my LBZ and it runs awsome.
LBZ intakes are good for 500-550 hp stock. Exhaust MBRP 4 inch turbo back is 399. I would shim the FPRV and add a lift pump, gauges and tranny and you will be good to go, the CP3 doesn't need any help tell the 600 RWHP level IMO. LBZ do have a habit of cracking pistons at the big power levels but I beleive poor tuning has alot to do with that.