Similar situation, where I was at 71 nights.

Marriott Visa made the decision easy, as I received 15 additional EQ nights on approval, so I'm now Platinum.

That card turned out to be a pretty good deal in my eyes: a free 1-4 cert, 70k points, 15 EQNs, and 1st year fee waived.

After 1st year, 15 EQNs, free 1-5 cert, for $85 annually, I think that's a good deal for a business traveler who stays at Marriott a lot.

Now with Plat, and the card, I can really rack up Marriott Points. It will be quite significant a boost for me combining Plat with the Card.