Noob warning: I can't find a final Sprint i9300 ROM, how to update CM10

I initially used ROMmanager from CWM to install CM9 on my Sprint i9300, it worked well, then I rebooted, the phone would not boot, so I had to start over install CM10 experimental. I made the back-ups with ROM manager for the stock ROM (rooted of course) and the CM9 ROM, I'm not sure what I did wrong but they would not boot.
all i9300:
[link removed]
Everything I've searched directs me to these files at the CM download site. I started this mess at 5pm, I give up.

So I loaded-up CM10 and the phone works and I'm pretty happy with it. However, is there anyway to update to newer nightlies to fix a few bugs I'm experiencing, without starting from scratch with a new ROM everytime?

Thanks for the help, newb-bash away.

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