KnJ

if you have a 10 year card now - you can decide what to do later.
if you have a 2 year card only, and its coming up on expiration, you have only one choice - file ROC.
it's not the 'length of marriage' that's important here, but the 'length of time since issuance of first green card'.
so - what's the date on the first green card, as printed on it?

When I called to ask about mine, the guy told me that you have to look it up based on the case number on your biometrics letter (not NOA1) it sounded really strange to me, but we had misplaced (now found while looking for our W-2s) it so I wasn't able to confirm.
Update on our case: We have been transferred to our local office who will schedule an interview. I am alternating between confident and worried. Confident because we actually are indeed a married couple. Worried because we had an interview for the first GC, and Nik flubbed some questions ("I'm not good with dates") the first time around. I guess we will have to have a study session on important dates. Looks like almost everyone is being approved without interviews, so now I'm on the worried side. Also, I sort of thought that if they interviewed you for the first card you usually didn't get called in for the removal. Ergh.
Sorry I haven't been around cheering everyone on. Just not as interested in VJ when I'm not channeling my "I miss my guy because he's so far away, how do I get him here sooner" into forums addiction.