what sps are you wanting? Acros? Easier stuff? Makes a huge difference in how you will light it and flow it? On that note, what lps do you want? Euphyllia? That heavy flow that acros thrive in could be troublesome for torches and hammers.
All that said, my advice would be to stay old school with an ati sunpower t5 for great coverage and longevity, and also an LED bar (quanta/ orphek) for additional par and coral color pop. I also really like all LED light bars.
I would also say that if you want to go mixed reef, and haven’t already bought a tank, go as big as you can afford. I have a 65 gallon (69 actually) but same 3 foot footprint and regret not just starting with a 4 foot tank. I’d love a 6 footer but it’s out of my price range for what i would do. I have a 4 footer in the garage waiting to be set up.