Hi,
I currently have a live Oscommerce shop on my VPS Hosting account. Things had been going well up until recently, when I learned I am out of PCI compliance. I have been going back and forth with Security Metrics, who is advising me of certain issues which need to be fixed. Unfortunately, my VPS Host is unable to assist as they do not support the Oscommerce product. I have applied all known Oscommerce patches, but am getting nowhere fast and still remain non-PCI compliant.
At this point, I am willing to switch hosts and even shopping cart systems in the hopes of gaining quick PCI compliance and perhaps some new features. I have heard that Shopsite is a well rated shopping cart system. Are there any good hosts that will actually ensure that I am PCI compliant, without my having to do all of this legwork?
Thanks in advance.

Do a search on here - some webhosting companies say they are PCI compliant, but keep in mind, that will not make you PCI compliant. PCI compliancy is an ongoing process.
You can take a look at List of PCI DSS Compliant Service Providers (http://usa.visa.com/download/merchants/cisp-list-of-pcidss-compliant-service-providers.pdf) for some ideas as well. But just switching to one of the providers will not put you into compliance. You still will probably need to complete the questionnaire, etc. And some hosting providers let their compliancy lapse, something else to consider and watch for.