I have the A4 Ultra and I love it. It weighs about 9.5lbs, I find it perfectly manageable. Definitely worth getting the newer Ultra with the magnetic pickup, I wouldn’t have liked it anywhere as much as I do if it only had the Piezo. Fit and finish is perfection, even the action is set bang on, which I feared due to having a non adjustable bridge.
I noticed Wunjos in London have a 5er in store, although that won’t help you much being in Dorset unless you happen to be going there any time soon!
These will tell you pretty much all you need to know:
http://www.youtube.com/watch?v=3zYPr3vMpNc
http://www.youtube.com/watch?v=9Q2ru-mXTg8