I'm looking for an e-commerce software, which I can host myself (hence I want to import a lot of products. Our catalogue includes every product you can order, not just our stock. So that's why the no product limit would be important).
Advanced import: I would like to import my products from an XLS or CSV file. At the file upload, specify the rows, the data, what to get imported, if I want to merge or replace, etc. Everything you would expect. I don't want to edit the products one-by-one. That would take forever.
PHP: I have a Debian 6.0 server up and running, which I can modify any way I want. So anything that can be run on a Linux server is fine. (ASP.net would cost me wonders, hence you have to buy Server2008R2 AND the SQL.)
Open-source, and free alternatives: I tried many of them, just recently. They provide a viable webshop, for anyone who starts a new small shop, and wants to have his stock uploaded. That's fine. But you can't manage mass amount of items. Nor modify them, etc. Installing plugins is one way, but the only plugins I found were not free, and really badly written. Poor quality, full of security holes. The developer couldn't be found once you paid him. Hiring a developer again, is a waste of money and time. Hence he have to code this all down, and he will ask magnitude larger amount of money, also, if he obfuscates the code or decides to leave, I can't do anything.
That said, free software is not out of the league, but my personal experience says otherwise. This is not a shopping recommendation. I'm looking for a software.
(There is a Wikipedia entry, and many hits if you do a search. But the Wiki is really outdate, and the hits are mostly just SEO based. Even if you manage to find a product, it's highly overpriced, and hosted by the company (thus monthly paid). It also comes with a low product limit.)