Best Shopping Cart?

[iceflyin]

Whats the best e-commerce/shopping cart system for a website with approx 2000-10,000 products?

I'm looking for something which is customizable and has a database designed good enough to keep page-views preferably under a second.

[gnomeontherun]

http://www.opensourcecms.com/ There probably isn't a 'best' but here are some test ones to see which might work best for your needs.