Going back to stock help

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http://forum.xda-developers.com – Hey guys my s3 killed its self yesterday so I grabbed one of these beauties today and I'm really impressed so far(maybe its the custom ROM). Now I got the phone off a guy, had it he unlocked the bootloader,rooted,and gave me the phone already running 4.1(dirty 1.8).no back ups to even a rooted stock. Although I love jelly bean this battery is killing me and I would really like to have at least a stock zip I can flash in emergencies. I am so unfamiliar with HTC(nexus one was the last one I owned)thank I really don't want to brick it. OK so my questions are these I have the rogers version of t (HowTos)