BillyMaysFan59: Resisted the mild temptation to buy the newly released Anno games. They look nice, but at their current discount they aren't enticing enough.
I can highly recommend the Anno games and like them all except for Anno 1503 which is the most challenging one but not necessarily in a fun way, it can get tedious and is for people who -really- like to micromanage. In some ways, it's the best Anno game in terms of the gameplay complexities but I didn't enjoy it that much personally. I'd start with the original 1602, combat sucks but it's a very relaxing experience. 1602 has more charm, 1503 has more complexity and challenge.
1701 is fun but lacks the challenge of 1503 and the charm of 1602 so I'd prioritize getting the other ones first, and hopefully 1404 if they add it to the catalog. 1404 strikes an ideal balance, not quite as anal as 1503 and not as simple as 1701, and more advanced graphics of course. In terms of graphics, 1503 is my favorite as I prefer 2D any time of the day.
If you've played 1602, that's pretty much all you need for the series and the best place to start unless you get addicted and can't get enough after that.
Anyway, waiting for a deeper sale can't hurt, especially if you're on a clean for soandsomanydays run :)
The recent additions of Archimedean Dynasty, Albion and the Anno games have been an absolutely magnificent addition to the catalog (exactly what GOG is about) and getting any of those at some point is no sin but rather a must imho.
PS: Haven't played the sci-fi Anno 2070 game so I don't know how good that one is