Firstly, please, please don't start by recommending an independent bike shop. I live in a very rural area, and my 'local' (ie 30 odd mile radius) shops don't have much of a selection at all, are very focused on serious cycling and tbh from experience at the price point I'm looking at (say up to £600 or so) they will be selling me what they have rather than helping me find the right bike.
At the moment I have a Dawes Galaxy Cross - it's a real workhorse bike, weighs about 15kg plus I have mudgards, trailer hitch, heavy duty pannier rack etc etc on it. It takes a lot of abuse & is perfect for hacking around with 2 full panniers & crates strapped on the back.
What I'd like is something lighter that I can have fun on - I've been riding dd's bike (Islabikes Beinn 27) a bit while mine was being serviced, and it's just been amazing feeling the difference in weight even though it's really too small for me. I ride mostly on road & reasonably decent tracks, so don't need suspension or a 'proper' mountain bike, but definitely want a bit of grip on tyres / not drop handlebars. Pretty reasonable hills where I live (my commute to work involves a 120m climb in 2 miles) so again need some reasonable gears. Any suggestions very welcome :)