nice build mate
i hope you wont have troubles with what power supply.
from my own experience I have email@example.com + ati 4850 and my 530w psu wont let me oc my 4850 higher than 650/1040 ;//
when i ran q6600 at stock I could oc it to 690/1180 and it was stable
damn psu need to get better one xP