Since you are dead set on changing the stock cam out, i would at least wait until i got heads and do it at the same time. I installed my cam and 1.7rr at the same time, before any heads. I wish i had just installed the 1.7rr for a little added lift etc. (they should give you a little more sound.) and waited for my heads for the cam. The idle will suffer etc., you will gain very little power, and your daily driveability will suffer without chip tuning or a tuning device. I have figured out one thing when people such as VIB, KILLLER, RC, RIO, OINK, etc. all agree on something you can pretty much take it to the bank.
Jason