I too am looking for a DE bag and went to try the Westie on today - the PM strap was a little tight over a winter jacket - but overall - nice bag - the GM is a very nice size - not too big.
I give a big vote to the Westie. It's my go to handbag for just about everything! I don't even keep it in its dust bag because I use it so much. Good Luck!
I have the Marylebone GM and cannot say enough good things about it. RUN, don't walk, to LV and grab it before the price increase. It is the perfect bag!