Please Help Me Find a shopping cart!!!

[BioFall]

I have searched for days and have found nothing that works:

cartplog - Not-Suported, only physical items

vbCommerce - Don't want to have to fiddle around with credits

digishop - vulnerable to hackers??? can't get on to the guys website

iCart - Mostly for 1-10 products, I have 1000+ with lots of subcategories

Right now I am looking at this. I guess it's some sort of e commerce integration. I don't know if it will work but it's the only thing I haven't tried.

If anyone has any recommendations please tell me. here's what I need:

- SubCatagories

-Paypal

-Downloadable

-Purchasing Options

If you can help me out, I've seen a lot of people look for a good vbulletin shopping cart mod and I can't believe their hasn't been a quality one made yet.