Hi,
It's always best to try a boot on before you buy but if you cant, try here: www.silvermans.co.uk. Phone them, they'll put you in the right boot.
A good quote would be "look after your feet and they'll last you for miles". Although good boots are expensive, quality costs. They'll not let you down and you'll get the benefit every step you take, it's an investment you should always get right.
Personally i have two pairs of boots, Altberg Sneeker - kneel to fire, lightweight and very flexible for the milder months and Meindl Dover Extreme for the colder months (with an extra sock). Both boots are well made but both have their places.
I've had my Altberg for 5 years and the Meindl for 3 years.
Hope it helps.