Pheonix 14k's are great DE bulbs... great color and usually one of the highest rated PAR values in the "color" type bulbs (spectrum's above 10k). Also, they seem to be on the lower end of the price range for new bulbs if you can't find a used deal.
The AquaConnect 14k plus bulb is very good as well... PAR values usually right there with the Pheonix bulb, but a negative is that they cost a considerable amount more.