Lion is ok but Chrome is no longer updated for it and can hardly find anything in the App Store for it. How can I put one of these three versions on it?
Assuming your Mac is still on the upgrade-able list, and since you are running Lion, you should be able to upgrade via the Mac App Store. The upgrade to Mountain Lion is $19, but after that, the upgrades to all versions of OS X are free.
If your Mac Mini is no longer on the upgrade-able list, you can't go there.
I don't think officially it can be upgraded, I was reading some white iMacs are using Mavericks so I was hoping to do the same with my wife's Mac Mini.
Sadly, Apple dropped the 2007 Mac Mini from the list of Macs that OS X supports years ago. The last version of OS X you can use is 10.7 (Lion), so you're already at the latest version available.
I've already switched from Chrome to Firefox on my 2007 Mini, and that works quite well, so there are still some good apps available...
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I don't think officially it can be upgraded, I was reading some white iMacs are using Mavericks so I was hoping to do the same with my wife's Mac Mini.
Lion is ok but Chrome is no longer updated for it and can hardly find anything in the App Store for it. How can I put one of these three versions on it?