well what are your goals? is this a street car? i think you need to do a little research ... "i want the highest compression possible w/o bending valves" are you sure?
i agree with the thought of not bothering with valves. unless you have a lavish goal, can pay a lot for tuning. but from the looks of it, your setup is pretty practical.
if you want to stay oem, p30 pistons are your best bet. in a gsr block with gsr head, the compression is 11.6 (according to c-speed). that should be ok for those cams, but from what i remember, they like somewhere around 12 (i don't know though). if that is true, maybe mill the head a little or get a thinner head gasket. personally, i wouldn't do either of these, as bending the valves becomes a little easier. if you're going to bump compression, do it with pistons. but that's just me, many have done it and are fine. it's your motor.
you could also consider pct pistons. c-speed says it will be ~12.1; however, there was some talk on ht about it actually being close 13:1. here's the link:
http://www.honda-tech.com/zerothread?id=717928&page=1
P72 head/B18C Block: STD = 12.924594026551906
i'd say that's a little high for a street driven car. unless you don't, paying $$$$$ for lots of tuning, and can live with a very tempermental motor.
some use them with out issue, some have the motors blow up after a few hundred miles. Omniman, someone who's experience and credibility i value highly, maintains that ctr pistons belong in ctr motors.
i'd go with the p30s, or maybe some aftermarket ones. do your homework first, this is nothing to take lightly.