You have a decent chance if you generally have ok luck with the RNG, but it's not guaranteed with that amount. You'd need 1165 if you wanted to be 100% sure that you would hit it during the rebate. Otherwise there is always some risk that you won't hit it during the rebate and then it could take you up to another 200 refines potentially. It usually takes me at least 800 to get from a level 8 - 10 during a rebate event.