Reply to USB to MIDI custom controllers

As a complete novice to all of this, can I ask if anyone will supply any info regarding building your own MIDI controller. Specifically the types of hardware (USB-MIDI) to control software, as well as their pro's and cons.

As far as I am aware I have only found 3 solutions.

http://www.ultimarc.com/JShopServer/...c=3&currency=4

http://www.leobodnar.com/products/BU0836X/

http://www.sparkfun.com/commerce/pro...oducts_id=9108

I consider myself relatively competent on the physical building of a system (I'm an electrician), but the software part may take a bit of getting used to.

I would look to be controlling Traktor, and possibly Ableton, (if I get the hang of Traktor first).

I have had a quick look through the community but can't find any threads on this. If there is one already created, feel free to merge this thread with it.

Thanks to anyone who replies.