I keep bouncing around my ratio of the three, but its tough because there's alot of codependent variables. If you have lots of spell damage, reducing cast speed is better off than recast. If you're hitting diminishing returns in cast speed, recast is better. If you have lots of procs casting speed is better. If you use AE spells alot crits are relatively more powerful than spell damage...but if you normally AE more 4+ mobs at once, spell damage gets the advantage. If you use your smaller-amount spells more often crits are more powerful, larger-amount means spell damage is more powerful. If you're fighting higher-level mobs, crits are weaker. Getting the mythical is going to add a whole new headache for me based upon how often the clickie is used
All that being said...with about 850 SD now, as far as gear goes I'm currently rating 1 base = 2 cast = 3 recast = 3 crit = 40 SD. I think when I get another 50 SD I'll be kicking up the 40 SD to 50 SD, as I'm already hitting the cap on a few spells.
__________________
Mezelast - Najena's first 80 Warlock
Mezelardo - 80 Paladin
Mezelina - 80 Berserker - Retired due to SOE hate
Mezelline - 70 Defiler - Retired due to SOE love
I

AE IN '08