A lot of people keep male boas in 4x2 so you would likely be ok with that cage for quite some time and maybe forever depending on how large he gets. A male columbian boa you are looking at probably 6-7 feet, hard to guess without a better look at him what morph/type but he may be. Would I buy that setup? No, I'm pretty picky when it comes to my snakes and cages and prefer to get exactly what I want but looks like a decent quality cage from the pictures and probably was expensive. The boa itself if a common bci is worth probably around $100 and I would be concerned about how wet that tank looks and checking the snake over for scale rot. Also can't tell if any of those heating sources are on thermostats.