WooCommerce – best caching method?

Hi guys, I need an advice.

Let’s assume that I have a WooCommerce store with 4000 products + a bunch of filters (color, size, category, material, type) that multiple the number of total pages a few times.

Besides that, the manager takes about 100 orders per day, which means that I’ll have to flush the cache of all category-pages each time the stock is reduced.

What’s the best caching method for this?

Thank you!

http://wordpress.org/extend/plugins/w3-total-cache/