All of those power supplies will fit in the case you linked to, as that is a standard atx case, and those are all standard atx power supplies.
As for the active pfc issue, they aall have active pfc, it's just an omission on newegg's part. Go to corsairs site to check if you need reassurance about that.
I personally would go with the nonmodular 650 watt unit, as that would suit my needs. You might be planning a system expansion that would make the 850 w u nit more appropriate.
thanks a lot for clearing that up! since im not looking for the best look, but the best bang for my buck, i guess ill stick to the non-modular one!