I have a dual CCFL set in my computer. They work great and are fairly bright. They disperse a fairly even amount of light too, so if you put one on the top of the marquee area and one on the bottom, you would probably get a nice even amount of light, especially since the marquee is only a few inches tall. You'll just need to extend your Molex connectors to light it, as buying enough extensions to reach your computer is probably a waste of time and money. Just cut the wires an inch below the connector, solder on an extension wire for each one and you're good to go. I've had mine on almost 24/7 for about a year now I guess and they are still very bright. Plus, SVC sells replacemnt bulbs for 2 or 3 bux if I remember correctly.
Also, SVC is a great company, I've ordered from them before, and I can't say enough about them.