Thanks for the replies, folks,

In reality, its the cost and waiting period that I'm trying to avoid. I realize that the $350 or so for renewal is not a huge amount and that its for peace of mind, but if its not required and if marriage is a safety net, then why bother? I'd rather put it to better use. By the way, I have been in the states for 30 years. I am currently 33, and it is my own fault for not applying sooner. God knows why.

It seems like hiring a lawyer would as much time as, cost as much as, if not more, than just renewing greencard and filing n-400?

You folks know these things, not I =)

Side note, my wife and I make a humble but comfortable living, although we can afford these costs, we do not have disposable money just laying around either.

Simply trying to find the most viable, cost effective and efficient way.

My appreciation...