Gluggy i fell into the same confused state you are now in
1.60.93398 is the ARMA II Beta patch it will also work on non beta servers.
to run this you need to use the "Launch Arma2 OA Beta Patch" short cut on your desktop or in your C:\Program Files (x86)\Steam\steamapps\common\arma 2 operation arrowhead folder (this is my location yours may be different)
1.70 is the DayZ patch once you have this installed you can only play on 1.70 servers.
Now what a few of us have done is have two addon folders
"addon" with the 1.70 patched files in it and
"addon v160" with the 1.60 files
when we play on a 1.60 server we exit the game and change the addon's folder name to "addon" to be "addon v170" and the "addon v160" to be "addon"
Then wooohoo we are joining the ARMA II beta 1.60.93398 (cos its backwards compatible) DayZ 1.60 server
confused still ? shit i am
so many patches to different levels of the game its all a bit hard at the momment. Hope they get it all the server up to level again very soon.
If you are still haing troubles yell on TS and i'm sure one of the guys will spend some time with you to sort it out.