jasonX5:
I found a cressi sub aqualight on leisurepro for $204. Many people said that I couldn't find a quality BC for under $400 would this qualify?
I don't know who told you that. There are plenty of quality BCs under $400. They may not have all the bells and whistles, but even low-end BCs are likely to be durable and functional. The Cressi Sub Aqualight is no exception. If it's the sort of BC you want, I'm sure it's probably fine.
jasonX5:
Now, my question is does anyone know anything about this bc?
Not me... at least, I don't have any experience using that model that I remember, though it's possible I may have rented one at some point and not taken notice.
jasonX5:
The cheapest bp/w is double the price, is there really that much of a difference?
Yes and no. From a single tank recreational perspective they both do the same job, and both can be used equally well. However, there are definately major differences in they way they feel, and what they're capable of. If you ever decide to persue more advanced diving, you may find the Cressi is no longer adequate. That's not a problem you'll have with a backplate and wing.
jasonX5:
I know the goal of the bp/w is to become more streamlined, but is it worth the price?
There's a lot more to it than that. If it were just about streamlining, in my opinion it wouldn't be worth it. Since I find it helps with streamlining, trim, simplcity, configurability, maintainability, and allows me to use either single or double tanks, slung stage/deco bottles, and carry less lead, it's more than worth it to me. Of course, I mostly dive dry in New England. YMMV.
I recommend trying one before you buy though. You seem interested, and if you decide to get one down the road, you won't have saved any money by buying the Cressi first and "outgrowing" it. A Cressi and a bp/w costs quite a bit more than a bp/w. If you try it and still don't think the expense is warranted, by all means, save a couple hundred bucks and get the least expensive BC you'll be happy with.