A Blade is basically what we call a bb3, it is just the newer cabinet with a lot of leds built into it driven by the emotive controller. Basically if you have a bb2e and plug in a cpunxt3.x mpu, you can run blade games. If you have a bb2 and install an emotive controller (or do the backplane mod), and install a cpunxt3.x mpu you have essentially the same as a bb2e without the leds.
I don't really know the difference between a 3.0 and and 3.2, someone once told me they updated the cpu on it for a slightly faster one. There's also a 3.5 which basically has a newer video card.