Hello and welcome!
We started our 55 with a 2x54watt t5ho light, fine for fish, not corals. Added a few lps and they did not do well at all. Added another $500.00 led fixture, good for sorties and lps, not sps. That was $1,000in lights in a few months. I'd say get a fixture that will allow you to try everything when you are ready up front rather than spend the money having to upgrade as it will cost you more to do so. I don't have a canopy so can not speak to heating issues, but with only 2 t5s it's not an issue.
Watch this forum, there is always loads of stuff selling, or you can throw a post up stating what you are looking for. You could get all your live rock from ppl selling here rather than the lfs at a fraction the cost. Base rock is great but can take a long time to become live.
Hope that helps! I'm sure there are others who can chime in as well!
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