Xzin,

I have had a lot of experience as a 70 lock in competitive arena teams and I will say the MOST important counter against a lock is in fact grounding totems and/or a rogue stunlocking. If our team ever went against a team with shammies, they always gave me a headache. If you can figure out a quick way to counter the totems, the setup is quite formidable. Curse of tounges is probably the most important curse to have up on healers at all times. Other than that, everyone dotted up and keeping the MS warriors off you and you should be good to go on outdamaging the healers. Not to mention, most locks at 70 are pushing 12-15k hp if you stack the stamina. Tie this in with Fel Armor which increases ALL heals on the locks by 20% and your priest is healing them for quite a bit.

Its a tough choice between the different specs, I tried them all. I personally preferred affliction tied in with the stam/imp hs talents.

Our strat that usually would almost always win games is drop their MS warrior first if you can, as they themselves have nothing to avoid your dots such as ice block/etc. Once that is taken care of, its cake from there. Not to mention, once their warrior is down, they usually have nobody calling the assist and focus fire (as that is usually the warrior's job) and they will get unorganized.

If the priest gets cc'd or dropped fast, you still have healthstones that crit for upwards of 5-6k with Fel Armor on

I could see losing a few locks, but once the 20 dots are on its GG for them as long as you can outlast them. That will be the trick. Toss on the dots and cc/run around.

Now if only I can aquire the time and money to try it out...

Its all great in theory, but we'll have to prove the theory by practice.