I am also biased toward Arctic Fox - I have had mine for a little over two years now and have had only one problem that was quickly fixed. Great company, great owners forum www.afnash.com
As far as floorplans go, they are always evolving them. I heard that there is a new plan in the 27 series for 2008.Which 29 model were you looking at - there are two one with a rear kitchen and one with a rear lounge-I like the rear lounge best. According to the poll on the afnash forum the 27-5L is the single most popular 5th wheel, of the two 29 models the 29-5T is the most popular, but not by much. There is also a new 27-5B with bunk beds. All Foxes are made in Oregon and distribution east of the Mississippi is probably going to be limited again- you don't say where you live and that could make a big difference in your decission.
Not sure about the others, but with the AF you can have one built almost exactly as you like- just call and talk to the factory.
One thing I noticed is that all of the units you are looking at have slides - something to look closly at is how much access do you have to the inside of the unit with the slide in - ie can you get to the fridge? or the bathroom? You never know when you might want to stop for a minute to get a cool can of soda or use the bathroom with the slide in. You may not always want to put the slide out while loading it for a trip. Just something to consider.