In reply to Tricadam:
After years of crap bikes, I very much feel that it's best to spend as much as you can bear to. That said, it doesn't need to be a small fortune.
As you're in Glasgow I'd go to Common Wheel, off Maryhill Road near the Firhill Stadium. They're one of the charities that will set up a bike using second hand frames and parts to a spec that'll suit you. That way, you get a bike that'll do what you need it to, you can have a conversation about cost, and you end up with something a bit more characterful - it's important to have a bike you can fall in love with a bit - and, due to age, a little less stealable.
I'd say something on an old touring frame could be better than a hybrid, as such. Similarly light, comfort-oriented, will take potholes etc in it's stride and would be well suited to the extra-urban usage you envisage.
Good luck!