If you're happy with what you have, I'd say keep on truckin'. Why spend more money on hardware - buy more books!
I bought a front lit reader (started with Nook, now have a Pocketbook Touch Lux) and it would be hard to go back to one without the light. You know how the pictures of the normal readers always look like "white paper with black font", but really look more like light-to-medium gray paper? With the light one, it looks like white paper. I think the contrast is much better, and that allows me to read smaller fonts more easily.
All the lighting in my home is lamps (okay, the kitchen has overhead lighting, but that's it). So I tend to have pockets of better lighting and not so good (for reading). So having a reader with a built in light saves my eyes from strain.
I have read with a booklight....it's just not the same. I never seemed to get good coverage and relaxing my hand or shifting could change the angle and I'd have to start over. Then there's the glare.
I doubt I'd be willing to go back to a reader without the built in front light. But if I hadn't tried one, I probably would have been content with what I had before. I wish I could stop buying new gadgets....that $100 or so every year could go to my book budget!
