as above mate, definately no point in fitting low comp pistons if you are not planning on running silly amounts of boost. i looked into this when i rebuilt mine and was told not too, as homer j said you will loose a small amount of power if you were to run the same boost you currently run,
in the end i went for forged pistons using the same compression ratio and
im glad i did as my car seems to have slightly more power than alot of people running similar boost with low comp pistons and more aggressive cams and turbos.