Might thinking to upgade to STI brembo brakes later on.. any advice guys?? will the both fit my WRX?? cheers

If you mean will your wheels fit, then no, WRX offset is I belive 53 on a 7" rim, STi is 46 on a 7.5" rim, to be safe you will need something like 46-48 to clear STi calipers.

Agree with the above.
The Prodrive P-WRC come in 2 offsets ET46 for STi (to clear the Brembo's) and 53 for WRX.

However the ET53 will clear the 4-pots on both WRX and Classics