Heh, it was Andertons I was planning on going to as well, they seem to have the biggest range of stock within a sensible radius. Well, Peach are closer to me by miles, but their range isn't as wide any more and they've moved significantly upmarket in terms of what they offer.
I'm not that good either, but having been used to £400 guitars for years and then getting the Mustang which was an £800 one, the difference was night and day and worth every penny. I don't mind spending the extra on something that's right, but only if it is right. You're definitely right about paying unplugged first, for me the thing has to feel 'right' in the hands as it could sound like an angel weeping tears of joy when cranked up, but if it's not comfy then there's just no point.