I would look to go to Power Compact as although the bulbs are more expensive there are less of them necessary to light the tank. You should have enough wattage to provide good growth in mid to low light plants. Some of the plants that require high light might suffer a bit. The other thing to consider is if you will be getting any more tanks as your experience gets better. I have tried to keep myself using fixtures with the 21" pc bulbs so that when I replace bulbs I can bulk order to cut down on total cost.
T5 are more energy friendly but alot more difficult to find on a regular basis.
Just my two cents
Rob
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