Thank you all @ tPF for your input. There isn't a more stylish group anywhere, I am sure!
I've decided to keep the Valentino bag. Since I'll be using it for spring/summer, it'll work fine on the shoulder with lighter clothing. I also like that the Valentino is not as deep as the MJ, so is less bulky under my arm.
I thought the MJ's tdf green would be a great accent to my neutral clothing, but I think I will tire of it more quickly. Also, the more I looked at it, the less I liked the luggage-tag-style MJ label on the front. I think I will list it on ebay and see if I can recoup the cost, instead of paying to ship it back to BG.
Anyway, I also ordered a chocolate brown nylon
Prada tote with leather trim, but I haven't received it yet. I might just have two bags for spring and summer already bought! I try to buy one fabulous bag each season, and at the end of the season, I sell it and apply the money toward a new bag (I think there was thread about people like me). Of course, I have small bags and clutches that I keep over time to use for occasions, not every day.
Thanks all. I love reading what you all have to say about all sorts of topics when I visit tPF