Look at the Rockwood 2505s mini lite. It is a new floor plan that offers everything your looking for except the private master. It has a Murphy bed queen which folds up nicely giving your family more room in a shorter package. Plus the trailer only weighs about 4500lbs.
Damn, those are slick little units... I think it's going to be just a bit too small though. Especially if my kids want to bring friends or a grandparent or other family member decides to come along.
So far I like these models:
Salem Cruise Lite 281QB (doesn't have folding bunks or side entry though)
Wildwood X-Lite 281QB (no folding bunks or side entry - outdoor kitchen instead of 4th bunk.)
Jayco Jayflight 31 BHS (everything I want just a little bit too heavy)
Keystone Hideout 31 BH (I like this layout - on heavy side - lighter than Jayco)
Grey Wolf 29BH (layout is fine - no outside storage entry for the bunks)
Keystone SPRINGDALE 294BHSSR (a little heavy - hard to find with 4th bunk)
SURVEYOR 295BHS (tough to find in my price range - outdoor kitchen instead of 4th bunk)
SC-294QBLE - Surveyor Cadet (appears to have everything I want and the weight is right) tough to find here.
Thanks for all your advice thus far!