Whats the better cpu Q9450 or q9500 not much on you tube about the Q9500yeah, some stores in Aliexpress don't send to some parts of the world. You can search for the item on Ebay if you really need it.
cannot comment on the E5700, I never had a rig like that. I started from an e8400, which was later upgraded to a Q9500. The upgrade went without problems.