There is a good reason Soyo monitors are so darn cheap. I'm ashamed to say that I worked at a Best Buy for a few months and, in my experience, would never buy one of these monitors. The two I took out of boxes were broken right away, and I've heard about others having them break shortly thereafter. I've also heard that if you have to deal with the manufacturer to get them fixed it could be a while before you get it back. The Soyo is a great deal if you don't have a problem with it working. The price is fantastic, but it's a bit of a gamble.
My only thought is that if you're building the monitor into a cabinet, it would be pretty crappy to have to take it out because it's broken, or replace it with another monitor that has slightly different dimensions. I've never built a cab, so maybe someone else can help out. I would recommend to consider the size you'll be losing since it's widescreen as well.
I am by no means the authority on monitors, so do some research on the company and try and figure out if the reliability is a problem for you. Also, maybe someone who has owned a soyo can chime in and give their experience.