If you are only going to want softies go with PC, but if you decided to go with the T5, yes it would be more expensive, but you'd be able to keep pretty much any coral and clams. I think the T5 are also a little cheaper to run and the bulbs only need to be replaced once a year (PC needs to be replaced every 6 months). So in the long run, IMO the T5 are a better choice, because once you get a couple corals, your gonna want more and harder to keep corals, which require more light in most cases.
Feduke