And done. The new version can be seen here:
Tho I feel the (very) long list of input fields may become overwhelming for some, it should be easier to work with
Taking Conglox's stats/situation we get:
A word of caution though: spellpower and crit get their complete stat value when adding 'spiritual guidance' and 'intellect crit value'. IMO this isn't entirely accurate. You wouldn't consider critical strike rating as valuable as intellect and spirit, would you?
So, take the purple and cyan colors with a grain of salt