As some one who is close to your size (I think), I prefer Fredericks of hollywood for my bras. The X-treme cleavage brand is what I wear on a daily basis. Their corserts are cute but are only for the bedroom, and to be removed promptly.
the boning just doesn't hold the way a real corset does.
If you want a real corset, timeless trends is a great place for quality, yet reasonably priced corsets. <3 mine!
Hips and curves is another good place to look. All for plus sized ladies but all very cute. They also have nice corsets. If you are the smallest size at torrid, which I am as well, you will be in the smaller sizes on hips and curves. They have a facebook page and post random drawings and discounts all the time.
I'm sure ill have more to add later. I love lingerie! But I am on my phone right now.