need shopping cart to send e-mail orders

I’m using the Atahualpa theme and I’ve been having trouble getting carts to work. I don’t want a full or complete package or anything. I want to create products (I need to be able to use options or variables in the products, otherwise I would simply make a form.)
This is not for my main web site so I suppose I could switch themes but I did try that for at least one of the carts I tried yesterday and it didn’t seem to help.
Anyway, I don’t want to use paypal for this particular situation though the way their product buttons and cart works would be great. We actually need to get the e-mail orders and then invoice back with exact shipping for this situation so paypal doesn’t work for us.

Does anyone have any recommendations?
I must admit I didn’t try for very long with any one cart plug in. If it didn’t let me easily disable the payment gateway or set it to cash or something, I moved on and if it didn’t let me set product options with different price choices, I moved on. There were some that seemed like they might work and I spent some time creating test products and then couldn’t figure out how to put them on a page or I went to the post to look but the add to cart button wouldn’t work or wasn’t there.

I’m feeling a little frustrated now. I’m certain that several of these carts I tried would work but were lacking some instruction that if I knew it I could quickly recover.