I love the light I have (can't even tell you how MUCH of a difference it made...I betcha anything it's the light that's making it dull then)...I would recommend my light to you but it is for plants as mine is a planted tank and is more costly...but if you look and ask around you could probably find a good bright light that's cheaper than a plant light
This is what my tanks look like with better lights...huge difference, huh? (excuse the cloudiness it's just because I took the picture right after a water change)