Garage door control

[Spud Demon <spud_g00@xxxxxxxxxxxxxxxx>]

I want to automate my garage door using Linux.  The idea is that the
computer records which codes are pressed and triggers the door if one
is correct.  It also takes a picture of the person at the control.  So
I need recommendations for the following pieces of hardware:

* keypad -- to be used in the script, not as a console keypad.  It
will be mounted outdoors so it shouldn't be too expensive.  Preferably
USB.

* relay -- I found the Super4 http://emx.net.au/super4usbrelay.htm Is
it the best for the price?

* camera -- also mounted outdoors (but under an eve so it won't get
too wet)

* open/closed sensor

* USB extender -- the garage door is 75' away from the computer I want
to use, 30' away from one I could use in a pinch.-

Anything else I should know before I start?