I'd imagine you could do the rope lights for far less than $100. That's more than what I spent for the entire RGB LED setup including the power supply and controller. It looks like zenscope found a source for the whole setup around $50 too. That's not bad for cuttable, controllable LED lights. Of course outside of having company over, mine usually stay on "white" at the dimmest setting. At the end of the day I think any sort of bias lighting will get the job done of adding a really great look to the screen and reducing eye strain.
My theater build:
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Epson 5020ub /Denon AVR-2113ci / Darbee DVP5000/Definitive Tech SM 350 + Mythos 3 Center + 2 Klipsch RW-12D Subs / Custom 20TB Ubuntu Server + Win 7 HTPC/ Xbox 360 / OUYA / iRule Pro Controlled/120" Screen (16x9)