https://proconnect.intuit.com/community/form-1040/help/comparing-lacerte-and-proseries-and-proconnec... shows a comparison of features. 

The 20 states is most cheaply done with the Online Software, but I fear the interface might be time costly. You can give it a free test drive - do everything except print or efile - by looking at the forms in Check Return. https://proconnect.intuit.com/tax-online/ You can log onto the software with the user name and password you used to get here. The cost advantage is 1 state or 20 states - same price (Notice that they have a "sale" on now)