Sounds like you may be in the middle with the success of your site. If you truely feel that by paying 1,000s of dollars for an ecommerce solution would dramatically increase your revenue then by all means purchase the best. But, if that is not the case, then continue to use the free ecommerce packages such as Zen Cart, osCommerce and the like. Make the customizations yourself or contract one of the thousands of php programs out there to make the changes for free or a small fee.
The point here is to be happy with what you have unless you see a huge profit gain by buying a commercial solution. This is why Open Source is great for most small to medium size businesses.
Peace
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