my main problem with trainers online, or even in the store, is finding the right size, so the amazon or sportshoes.com free returns enable you to make sure at home; socks and shock absorbing inners (sorbothane - earlier thread) are important too.
Looking at the wear on existing, regular shoes, helps understand your pronation too, and is what I did, way-back, and re-appraise on shoes as they wear out.
With judicious purchasing in sales I rairly, if ever, payed more than £65 - wait for the next ebay 10% day too.
[have previously posted a shoe biography]