Which T5 lighting

[AQUA951]

I'm sorry if this topic has been beaten to death. I'm currently looking for some T5 supplementation with my dual 400 MH. I've look through marinedepot, reefgeek, and others but not sure what the difference or performance from one to the other. I'm trying not to spend too much money for this setup, probably 4-500 max. My tank dimension are: 84x30x24 and looking between 60-72" long T5 Retro kit. Any recommendation on which T5 lighting to get? Thanks, Ty