[Q] Need general advise for S5830 topic

I kind of messed up a bit with my Galaxy Ace S5830, so I'm about to wipe it again. But after thinking about it, I was wondering if there's a bit more that can be done for this legacy device aside of installing CM.

I first had CM 7.2.0 stable installed and overall it went fairly well for daily use, except for just a couple of issues: default camera not having zooming function, and this other issue:
http://forum.xda-developers.com/show....php?t=2596926
On IRC (cyanogenmod channel) I was told this probably could be due to Ace's awfully limited amount of RAM, which caused the updating app to not be able to temporarily store in RAM and use some of internal sotrage (limited as well), resulting in more and more internal storage consumed each time an update was performed. Or so I understood...

Also I noticed there are a few nightlies after stable CM version 7.2.0
http://download.cyanogenmod.org/?device=cooper


So, questions would be:

1. If I'm to install CM7, which one should I pick, stable 7.2.0 again, or latest nightly? I think I once read comments that latest build fixed some minor bugs and was actualyl good, but I do care a lot about stability and the Wikia site says nightlies are unstable.

2. Is there something I could do for the updates/storage issue?

3. Is there default zoom for camera on CM7, or would I have to download another camera app?

4. I've seen there are now some CM 9, 10, 11, etc builds for S5830, but they are unofficial and in the IRC I was told unofficial was generally not that good (and potential malware). Should I better stick with CM7, or is there by chance an "official" CM 9, 10, 11 mod?

Thanks beforehand.