First off, if that's a "Fellowship" LOTR movie poster, and you're really interested in getting rid of it, I'm interested! Dunno if it's rollable or if it has been mounted... Probably only if it can be rolled up would it be practical to get it to CA.
Regarding the IR repeaters, I'll tell you about the system I used. I had a Xantech "Dinky Link", which is a little gizmo about the size of a Chapstick. It's black, and has a small IR window in it. You could place it, for example, on top of or on the side of your center speaker.
The little receiver has a fine black wire that runs from it, and you would connect that up to some of the lines on that Cat-5 you ran to the front.
Back in your equipment closet, you mount the other end of the system, which is a little box about the size of two matchboxes. That little box plugs into the wall with an AC adapter, and has some sockets on it into which you plug little wired IR emitters. (See, for example, the Xantech CB60 or 789-44PS). This is called a "connecting block".
The little wired emitters stick on the front of your components, right over the IR receivers.
I get the Blink-IR emitters from Xantech, which in addition to the infrared LED also contain a visible red LED. This is great, because you can see if pressing a button on your remote is resulting in your emitters doing something. VERY useful for system debugging. The Blink-IR units are available in a "dual" model that has two emitters connected to one plug. So, for example, if you get a connecting block with four IR emitter outputs, you can control 8 devices.
So long as you don't have compact fluorescent lamps or a plama TV operating in the same room as the receiver, this system works wonderfully well. If you have CFLs (I doubt it, given your pix), then you would need a "CFL-friendly" Dinky Link receiver. If you have a plasma, then you need a "plasma friendly" receiver. These both have much more aggressive filters to try to reject the IR noise emitted by the CFL or the plasma.
Hope this helps!