ROMs for your phone are available here:
4.2.2 is Jelly Bean, 4.4.2 is Kit Kat. If you want to root it install 4.2.2.
If you install 4.4.2 you will have a locked bootloader that cannot be downgraded to JB later. If you take specific steps to make a Franken-ROM that can have write protection disabled and runs with the 4.2.2 bootloader you can have Kit Kat. You will have to decide if you think it's worth it. From my perspective KK isn't that big a deal, but I had a lot of fun doing it and learned a few things along the way. YMMV.
---------- Post added at 05:20 AM ---------- Previous post was at 05:18 AM ----------
"... you can have Kit Kat." Should say rooted KK.