Quickbooks Hosting (or other???)

Hello,

I currently use Quickbooks POS V8 and I'm hosted with Intuit.com (www.timeless-trends.com). I've hit so many walls with Intuit and I also have tried Iamodules.com and hit walls with them too.

Basically here is what I need to do. I'm hoping someone can suggest a solution.

I sell corsets both retail and wholesale. I need a site that will:
1. display my current inventory. or display inventory from the last sync.
2. allow wholesale sign up. currently i can only apply a percentage off for those customers but each product is different and needs a different percentage off. Quickbooks has different pricing schedules but that information doesn't import to intuit or iamodule.
3. Quickbooks allows multiple stores. I need to only display Store 2 (our warehouse). Currently Intuit will only display ALL inventory, not inventory from a specified store.
4. I also need USPS and UPS integrated. You'd think this would be a given but it's not offered at iamodule.

I'm not set on Quickbooks. If there is a better way PLEASE let me know. I keep signing up with these hosting companies who claim to do it all but after I waste a week building my site I find that they actually don't offer a lot of what I need.

Thanks in advance for any advice!
Jason