http://www.e-onsoftware.com/products/chart.php

 

There's the link to the feature comparison chart for the 'artist' versions; complete is the fullest. Infinite includes all that plus more.

 

And no, you get support for purchasing; what they have is a maintenance plan you can buy; with this, you get ftp space to upload scenes that are breaking Vue so they can debug the app, a much quicker response time on your support question or bug report. The really good thing about it is this; you get the yearly contract, and the versions released during that year are free. Usually there is a .5 release, and a full version release. Renew before the 1st year expires, and you pay $195 instead of $295, and get the same deal. That also includes any modules you've purchased (I got a 5 rendercow upgrade, and that has been upgraded each year for the Full version of Vue I get for free). The one thing you need is a decent internet connection, as these are downloaded releases (you can get them burned to disk, but that is a cost outside the maintenance agreement). I got it when they started, and have paid essentially $100 dollars every 6 months for a new Vue release. Once you download it, you can save to an external drive for archiving (or burn your own disk), put it on a flash drive and load your rendercows onto your various computers that way

 

I would recommend Infinite over the others; Xstream is only useful if you use Max, Maya, Lightwave or Cinema 4D. Otherwise, you have the same feature set. Make sure you have a 64 bit OS, and if its Window's install it on something besides the default locations....you can run into issues with Windows UAC real fast. 

 

And to be utterly fair, the .5 releases -can- be problematic at times; use those to field part of a new tech for the next whole number release, so the new feature set can look strange at times. But even if you skip the .5 releases, that is still $195 to upgrade a pro level piece of software.