I've gotten kinda partial to the draw weight calculator on Carbon Express' website. I plug my numbers in, it spits out a calculated weight and I go check the chart. Then I read across to find out what spine deflection that goes with the shaft they recommend. After that, I've got a spine deflection number I can take to all other manufacturers' sites and compare to their charts.

Doing that, I've found out that they're pretty darn close to each other.