would you be able to give us an idea if she likes handbags or shoulder totes? you have a lot of leeway with $1500 so we can all probably suggest a lot of ideas. if she likes the azur damier (white checkerboard pattern), maybe she would like the saleya mm or gm. are there any LV lines you know she WON'T like? that would help us narrow down suggestions.
The Damier Azur is the white/blue one. You can see the speedy in my picture below. I'll bet she would love the speedy and if you could get a vernis cles (coin purse) in perle, framboise, or pomme........well, it would be fab!
hmm, is your wife petite? because the Pampalonne is very large. a friend recently purchased one but she's almost 6' tall with heels.
since she has a large LV collection i am going to suggest something fun and say ROXBURY in Pomme. and since you are willing to spend $1500 or so, how about MC Audra in Black? that bag is very hot! i'm sure your lucky wife will love it!
the checkerboard pattern you mentioned: the Neverfull tote is going to be released in Damier and Azur so maybe you can hold out for that.
i hope she's very surprised with your choice!