The arguement about the ECU is that a LS ECU can be used on a VTEC motor with a activation switch of some sort i.e. a msd box or a regular old switch. But you are better off getting it reproggramed. Also i agree with rang, do it yourself and go lsvtec.
Take your time and do it right. Do a search on lsvtec and swaps before you start posting also go to google do a search. Good luck

Josh