IMO the best single standard fluor. light I have found both for plants and making a tank look great are the Triton. They are a full spectrum tri-phosphor bulb which, unlike reg. fluors doen't need replacing every 6 months for plants, and will burn for about 1.5 years and then go out. They are not cheap- they run from about 15-22$ each depending on length. You can find them online at Big Als or Pet Solutions.
http://www.bigalsonline.com/?splash_done=1
http://www.petsolutions.com/