Image resizing per site or generally...

Hi there,
I activated ImSanity networkwide. A nice plugin that resizes large image uploads from customers to a reasonable size.
Now I have a new customer, a photographer. You can guess: I want him to upload larger pictures.
How do you guys an galls deal with this??
Do you have this or another plugin to manage large customer image uploads.
As far as I can see now, I have these options:
- put the new client outside the network, in a separate install
- de-activate ImSanity sitewide and activate per site
- your input??

Curious how you think about this.

Thx and cheers,
Ronald