Re: Advice on buying module
For $300 you wont get a hi-hat that will work exactly like an acoustic. It will be limited in the amount of steps it has between open and closed. I think something like the Roland TD-9 has 5 steps between fully open and closed. That's not too bad, but not exactly like an acoustic kit.
The best hi-hat/module combo is the TD-30 with the CH-13, but those two things are between $2500-$3000. I have these and it is very close to an acoustic hi hat. The only things it is lacking is a bell hit sound and palm muting. Other than that it works exactly like an acoustic hi-hat.