Ok folks, I got started this weekend and it is coming along nicely.  I had some problems with Lowes when they cut the last piece of Lexan in the store 2.5 inches too short!  Not I have to deal with that...
After everyone's comments and speaking with the wife, I decided to go with a 1-button, 4-way joystick combo.  The idea was to keep it simple.  If it were for me, I would want access to 6K+ games.  I am thinking 40 will be good for the old man.
Here are some pictures of the progress so far.  I have most of it built; I love these bartops... they take no time at all!  All I have to do is drill the holes on the CP and rig some sort of monitor mount.  Once that's done, I can paint it and wire it.