There are three effective ways you can build your Wizard with the current cap at level 50. The first, which I recommend would be to take 15 CRIT and put the rest in DMG. This is the current build which I use on my Wizard and using this build you will Crit probably 50% of the time assuming you use the CRIT statted gears like listed above. The second way which you could build would be to put half your points in CRIT and the other half into SPD. At first thought you may think that's a pointless way to build however you're using your skills more often at a higher critical rate which can actually achieve a similar damage output of the first build. The downfall to this build is that you will lack damage if you're unable to successfully critical many times in a row. The third possibility, which is the most common that I've seen used, is to simply put full points into DMG. Doing so you will stand land a decent amount of crits however not as many as the two builds listed previously.