Bottom Line: If you have been married for 2 years (or longer) when the new immigrant enters the US via the spousal visa, he/she should be issued a 10 year Green Card. With a 10 year Green Card, you will avoid the dreaded Removal of Conditions (I-751).
I would enter a day or 2 after the 2 year anniversary. Removal of Conditions is not a fun experience. You should avoid it if, at all, possible.