I voted for buy used and save your money while you're figuring out what you want / what your tank needs.
I've got two T8s on my tank (former 40B, current 65g). They were bought used. My husband added new ballasts to them and I added new bulbs. With my first saltwater tank (20 high) I used a T8 fixture that my dad had used on one of his saltwater tanks back in the late 80s. It still worked just fine and got the job done. I'll probably upgrade to T5s soon for the 65g, but for now, the T8s are working for my softies and LPS. I am not looking to have the latest and greatest whatever. If my fish and corals are happy, then I'm happy.
I've got two T8s on my tank (former 40B, current 65g). They were bought used. My husband added new ballasts to them and I added new bulbs. With my first saltwater tank (20 high) I used a T8 fixture that my dad had used on one of his saltwater tanks back in the late 80s. It still worked just fine and got the job done. I'll probably upgrade to T5s soon for the 65g, but for now, the T8s are working for my softies and LPS. I am not looking to have the latest and greatest whatever. If my fish and corals are happy, then I'm happy.