Bottom mounted PSU - fan facing up or down?

Hi, i been reading all this people post and im wondering same as all you what is the best of a PSU and hope you can help me to find out my answer. my PSU is with the fan facing down(really never know if the fan is an intake or an exhaust fan, good point to know, but in case it will be an intake fan to drawn fresh air from the bottom, in this case mounted on myu HAF X) what do you think will be the result if i put it facing up sucking air from my video card and changing too the 2 fans of 200mm in the top of my case to intake air instead of exhaust air? i mean will be good cuz air flow will change to go inside from the top and the front of the case and go out to the rear. do you think this could be any good? i dont mind about my CPU temp cuz i have Corsair Hydro H80 on it so runs 20C idle and 35C load hehe, and my ram memory has memory fans from a corsair dominator airflow so i spect that air will pass from top to bottom just fine and be out from all the points in the rear of the case. hope you can help me and understand my point hehe. thanks a lot to you and all who read this and help me finding out =) by the way i have a coolermaster silent pro 700w PSU but i will changing it for a Corsair AX1200w.
Thanks a lot