yeah fellaz, i'm back after a week of car-less exile in Point... thanks for the well wishes, i got my baby back today

SO! the head was warped by 4 thousandths of an inch...
1. had it shaved to level it,
2. decarbed it using Purple Blaster (wow! that sh!t got clean),
3. took of the injectors and brushed them (with a tooth brush),
4. replaced head gasket with an OEM one,
5. changed plugs (they were in when the head went for pressure testing, plus the Platinum plugs were already starting to brown after 20K kms...),
6. reassembled the engine (used back the new thermostat), and
7. replaced coolant with Amsoil coolant (70/30 mix).
car is fully functional and rearing to go!

took her for a test drive, even with a/c on, and the temperature never budged. seems like i'm back "in the game!"
also, the a/c's still working, so i'm guessing the evaporator's good (might've just gassed a bit when the core burst, like
ron said). the a/c temperature control knob is still unstable; it's setting itself up on the cold side, but not staying in place at any one point on the dial... will schedule a check-up with an a/c technician to diagnose, and replace the a/c filter as well.