Take a look here
http://www.members.westnet.com.au/adsport/sc14fit/
step by step run down of swapping a SC12 over to a SC14 on an AW11 ZE, will give you an idea for what you are in for.
The SC14 swap isnt really expensive if you do it all yourself, Barry (Bazda) has done it for a couple of people on here if i remember correctly.
Bluetop CAMS, havent seen any documented evidence that they make much of a difference, other than from the seat of the pants dyno i.e. word of mouth.
SC14 WILL run fine on a stock ECU, I have confimed this with Mr Revhead, as this was a swap I was looking in to myself.
If you go aftermarket CAMS then depending on what you get you may need to go to an aftermarket ECU obviously.