a deparemnt store like debenhams or howells have the best choice as your budget is quite high
nine west have a lovely zipped tote this season at �60
radley tula hidesign coccinelle are all good makes
if you want to stretch another 10-30 quid check out francesco biasia bags at howells they are absoloutely stunning and look more expensive than they are, same goes for karen millen.
dune do birkin style bags at around �100
and as mentioned before tkmaxx is a good place if your willing to really look, i know they sell katerina lucchi bags (made in italy) at around a 100 and also micheal kors bags from his main line. ooo and they do guias aswell (well known itailian brand thats been going for years)
check out the aspinal of london seller on ebay they sell off all there seconds..for so little and the standards so high its not noticeable i bought there paris bag for �70 instead of 250.
if your lurred by an ebay designer bargin ask theese lovely ladies for help with its authenticity www.thebagforum.com
hope this helps
sorry about spelling its late