Most Popular Kickstart Is?

[little]

3.1, no question about it, you can always use WHDload to load old games that require older amigaDOS versions.

[little]

dammy wrote:

Am I right that this is in preparation for 68K emulation/integration?

No, it is in reference to the kickstart replacment actually.  

Then the best option is 3.1. Any prior version of the AmigaOS is popular because some games work only with old kickstarts, a kickstart replacement of version 1.3 would not be able to run 100% of the games no matter how polished it is, because some games do direct calls to addresses in ROM space and there is no way to reproduce the exact same behavior. In the end minimig users can use a 3.1 kickstart repleacement to boot their machines and use whdload to load games that require prior kickstarts. Of course this means more RAM is a high priority on any minimig revision.