You get what you pay for IMO. I just got a GT UL and am not at all impressed with the comfort.
Look at it this way, you could go the cheap route and possibly be happy with it. Or you're gonna end up realizing it doesn't work for you. Then you're gonna hafta convince the boss to let you buy ANOTHER hammock.
Or you could get the WBBB that you already know is comfortable and are more than likely gonna love and keep. If you don't love it then like everyone else said, resale value is high. Which means you'll recoup enough cash to buy the SBP and have some leftover.
Also consider http://buttinasling.com/1seyoha.html
. They allow you to build your hammock kit exactly how you want it. They have a single layer rated to 300# but you can add a double layer increasing the weight rating. I'd ask them if that would make it rated to 400# though. Depending on what options you choose you'll come out about the same as the WBBB. Or you can come out a lot less if you wanna DIY your bugnet. And these hammocks are very comfortable.
See if REI has the SBP, they have the best return policy. Try it out at home, if you don't like it return it and then get something better.