I will 2nd what Dave says. PBP is the only way to go. 90% of everyone that's ever
purchased PBC from us over the years has returned within around 30 days to upgrade
to PBP. It's the best out there.

For your particular application, have a look at the 18F2431. The motion feedback module
has a capture option specifically for frequency measurements, and makes it incredibly
simple. It automatically captures the 16-bit timer5 value on every rising-edge.

It also has 10-bit A/D with up to 200K samples-per-second, with simultaneous 2-channel
sampling.