here's why I prefer spell speed to determination. . the faster u pump out cure 1 for proc the better. high end whm gear like af 2 is well balanced.. takes to much determination to actually make a big impact so that skill is useless in comparison to faster cast times. they make divine seal for a reason.. and it works astronomically well in conjunction with higher spell speed.. in af 2 gear u should be healing over 1k pretty easily on cure 1.. with divine should be plenty of potency. . as far as maintaining mp with higher spell speed casting cure 1 over an over doesn't even move rhe mp bar very much.. its basically whatever u feel like doing friend.. with end game gear it doesn't really matter