I love GHW so I may be a little biased... but I don't think that it is too formal looking. In fact, my executive tote only comes out with me when I want to dress a little more casual. In my opinion, it's perfect for shopping and lunch dates - the detachable strap also makes it look less formal. I don't think I would use it for work either as it is quite delicate.
In regards to the price point, I paid AUD$3,400 for mine so $3,000 is definitely worth it. I've had mine for about a year now and have had no regrets. The structure has held up and minimalist design just oozes sophistication. Let us know how you go
Check out how Sooae styles her outfits with her cerf tote, just gorgeous! Might give you some ideas -
http://www.thehautecookie.com/?s=cerf