Unfortunately the short answer is no. You will always have the same problem. Even worse than that, once the three year period from the date you purchased the notebook is up, Apple may stop repairing the logic boards altogether and then you will be left with a useless brick, or the option to pay upto $1000 to have the logicboard replaced by yourself. (Which is a no-brainer as it will fail again in due course after that too. It is possible that Apple will extend the free repair date beyond 3 years, but don't count on it)
Don't be too disheartened though as you are most definitely not the only one is this position. There are thousands and thousands of people with the 8600 version MBP including me. I didn't pay $3000 in my case for a notebook that is doomed to a short lifespan either, but that is sadly the position we all seem to be in.
The replacement logicboard is usually denoted at "Rev 2" in the system preferences but there is no evidence to suggest that it is any different at all to the original and many including you yourself have experienced more than one failure.
As far as I can see, the only long term option is to sell you current MBP, take a loss and buy a new unibody when they are released soon. At least that way you wont have to worry about being stuck with nothing down the line. At the moment your MBP is still worth something. A four year odd MBP with a broken logicboard however will be almost worthless...
I've heard that generally, after 3 attempts to fix the same problem, Apple will give you a brand new machine? I guess once I have my logic board replaced again I'll have to game like crazy in order to break it once more before my apple care expires in August...I'm just not crazy on the design of the new unibody macbook pros...The black around the screen and the new keys suck.