So I've decided to go with Halides. However, the options available are a bit overwhelming. If possible, I'd like to pick up a used unit to save a few bucks but also want an optimal setup so I don't have to buy again anytime soon. If I can't find a good deal on a lightly used setup, I'm willing to just splurge on a new setup, but going to give used a go first. Seems many are selling somewhat custom setups, mixing and matching reflectors, ballasts and bulbs. Admittedly, the options available are a bit overwhelming. Which reflector, ballast and bulbs are best for a 90G (24" depth) SPS setup? Should I hold out for a halide T5 setup or simply a couple of pendants? Is a magnetic ballast better than electronic, and if so, which one? And then there's bulbs. While I prefer 20k color, I'm looking for optimal growth so I think 14k may be better? Are certain bulbs 'better' than others?