You get better coverage out of 3w LEDs. I just went with 12 royal blue 1 true blue and 8 natural white luxeon es (steves leds) for my 27g and they look great. I went with a heatsink from rapid led though because by it self looks a lot better and is easier to wire on instead of many tubes. I also used steves led drivers and power supply for the ability to get maximum efficiency out of the system. I also liked the idea of separating the psu and drivers so that if one fails I can just replace that part... It is more work though going that route.
Anyway I would go all 3w for best spread of light.
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