I second, third, fourth the need for:
1. Ability to print product labels that include item name, UPC barcode, and price.
2. Ability to do returns easily such as a negative #. It will be impossible to find a cash sale down the road.
3. I need to be able to put a wholesale value into the Shopify system. It would be even better if I could do an inventory report (ie how much inventory and what is it's value at any given time). However, even if I just have a wholesale price then I can export and easily multiply data to get the value but to do this I really need to wholesale price. This seems pretty basic.
4. The above may be deal breakers for me to purchase Shopify if they can't be included.