I just purchased the Island Margarita Elite last month, with diamond AOP and all lights/pillowfalls. Lights are great when you want them, and on a $10kish purchase I'm fine spending couple $100 for them. I figure if you get 10-15 years out of tub, its maybe $1-2/month for them.
Can't say on replacement costs on AOP.
We love the tub, use it almost every day. I will say @ease inline doesn't last very long and are quiet expensive compared to granular chlorine, so I've already switched after 1st cartridge hardly lasted 2 weeks. Your tub is a little smaller so may last longer, but ymmv.