Sales tax is in all of the 4 series versions I believe. We need to know what version you have in order to make any comparisons. The Pro version offers several additions, such as more user firlds. There is no formal list, as after a period of time some enhancements are also added to the standard version, and new to the Pro. By becoming a lifetime Pro Member you would also have access to the Fedex module and several advanced hacks, such as discount/coupon, logging orders to a delimited file for download, new items, etc. Also, some gateways require being a Pro Member to access the files, such as Paypal. Pro membership is one of the things that helps support the development of the project too.
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