I highly recommend against Coach. They are nice purses and bags but they aren't designed for function. I had one with DS and recently sold it on eBay because I refused to use it again, it was so annoying. Not a lot of pockets, hard to keep clean, etc.
I do like the Petunia Picklebottom ones, but after MUCH research, I decided on a Ju Ju Be BFF. A great idea is to You Tube the bag you are interested in and you can see some video reviews. I watched a ton on all different bags and it was a no-brainer to get the BFF.