It seems to be the general recommendation that all of your initial points be spent in the Crusader INT line, at a 4-4-8 distribution. This gives you something like 63% critical chance on hostile spells - a huge bonus. After that, it seems for SKs mostly soloing (and even those grouping), the next points should be spent in the Reaving line until Reaver is obtained.
After that, go with what suits you!