are u startin from scratch? or do u hav a hood tht u will be guttin and addin new lights to? ahsupply has pretty cheap diy lights, might be something u want to look into.
i have a 10 gallon. but the first time i built a hood for it, i bought from home depot, when i "upgraded" and went to ahsupply i actually spent LESS even with bulbs. and with their super quick shipping i get things in less than 3 days.