well, haste lowers HL more then FL. If u cast only FL, 450 haste is about all u need.
i'm working on being 50/50 hl fl atm, and it seems to be working out fine.
i have 34% holy crit unbuffed, near 500 haste now, and 24900 mana unbuffed. I just cant see the pt in stacking ONLY int. I see guys with the plea and nobles int deck both with nothing but int. why the f do u want 29k mana unbuffed. That means your regen is way less, your crit and effective healing is less. SP is less. haste is less. Right now on 25 mans if i spam flash 100% on cd, i gain mana. that will change in 3.2 and it really should. But trinkets like SotDead will help out over int only trinkets like nobles int deck.