Recomended Shopping Carts

I need to setup a shopping cart (SP) for a client and time/budget calls for a premade SP. I've checked hotscripts.com and google and it seems to me that there are as many SP in PHP as CMS or Frameworks in PHP, in other words, too many to review. I've heard complaints about osCommerce as being nice but too hard to modify to your needs. Are there any recomendations on SP that you actually use in medium to large projects and you were happily surprised? Thanks in advance, -- ----------------------------- Adrian Esteban Madrid HyperXMedia, Developer ================