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I would hold off of 2.2.3 for now. I tryed it a few days ago and it broke my site. I'm using 2.2.2 for now. It's not as buggy but people are reporting some problems with it. Note however if you do go for 2.2.2 do not turn off your site before the update, you won't be able to login...
Out off the latest updates I would say 2.0.13 is the most stable. Make sure your modules are compatable too and be sure to backup everything first.
Oh, the updates are in the "download xoops" section.
<---- over there
