Christmas is coming and I'm going to make me a present...

an envelope filter, but I don't know which one.
The Fat Man is pretty cool cause it has this key input thing where you can plug in a CV pedal or anything else.
(kick drum, step sequencer, drum machine, WOW!)
The Prometheus is really a cool pedal, has all the parameters which an envelope section has to have... this step thing is also a nice feature, but I think it could be hard to be in time without an expression pedal to control the speed....
also it has so many features, that I see me tweaking around all the time instead of playing....
the Copilot Gyroscope seems to be another possibility for this step-rate thing. and it has got an exxpression pedal input for controlling the speed.
any opinions on that one?
http://www.copilotfx.com/gyroscope.html
I'm doing some jazzy-drum'n'bass-house-shizzle type of music, where I often have to "wobble" and imitate reece-basslines and stuff, so extreme sounds are very appreciated!!
so anyone tried these three or at least one pedal and got some pros/cons?
I'm from Germany what means that I always have to buy pedals to try them...
cheers,
merten