I have one of those skip hop bags and it's great. I have a couple of Petunia Bag, a Kate Spade bag, a great messenger bag but the Skip Hop one I bought in Camo for my dh and I used it all the time. One of the flash sites has Petunia on it today.
I love my Skip Hop moreso because of its functionality. I can cram a ton in the inside and all the pockets. I only got it in black though because i wanted something that DH would be willing to carry. Last thing I wanted was to be the only one lugging the crap because he won't carry a girlie bag.
See, I don't like skip hop. I had that bag, and couldn't get what I needed in and out of it (too tall and deep). The bag I currently have, the zipper broke almost immediately.
I don't really like the looks of most diaper bags so I just went with a large Ralph Lauren tote. I love it. You'll have an easier time just finding a big purse to use as a diaper bag. You can buy any other things like a pad or insulation for milk seperately
I think I remember seeing that bag on sale at Nordstrom on Michigan Ave last week or the week before. It was under $50. You could get it and always take it back if you find it doesn't work for you.