M2N68-LA Narra2-GL8E motherboard

Hi all,

I want to replace my seemingly malfunctioning motherboard - M2N68-LA Narra2-GL8E - but I can't seem to be able to find exactly the same one.
What I noticed is the "Narra" increase (Narra 2,3,4 etc), I assume that's a revision???
My question is which motherboard should I get that would be compatible with the rest of my system? I've been researching for hours and can't find an answer. You guys are the first I found that seem to have substantial knowledge in these matters.

Thanks in advance.
-Panos