Shopping Cart recommendations

Currently attempting to help a client locate a shopping cart that can do the following:

Reliable!!!

Easily Updateable from a spreadsheet

Downloadable sales in spreadsheet form – ideally in a format that can be imported by Quickbooks.

With Multiple level categories, with the ability to put items in more than one category.

With the ability to enter a html link to the manufacturer

Works in US dollars – calculates tax

Ability to limit access to those who will pick up their order.

With the ability to turn off inventory control (we are currently doing “group” orders on a monthly basis)

Ideally the cart doesn’t empty when they logout, so they can come back and continue shopping. This is a pet peeve of mine with many shopping carts.

Ability to add required fields to the shopping cart – such as a field to indicate who will pick up their order if they are having a friend do it.

Ability to email those who order – when order has arrived .

Any recommendations and links to shopping carts will be welcomed. I have found carts that work with WP that do only partial of this and partial of that… but nothing that I could find that would do all of the above, or the support element to answer these questions.

Thank you for your help