MR Premier Visa? I don't leave home without it. I charge everything on it because I'm trying to get 3 million (now 2.5 million) points as fast as possible, along with the 1000 nights for lifetime status. With elite rollover nights, the limiting factor will increasingly become number of MR points. Heck, I got 102 rollover nights from last year. So now every single night I log this year will roll over to next year. That's going to make getting 1000 nights a whole lot easier.
Username, I used to have the SPG AmEx card when I aimed the bulk of my business at SPG. I now aim the bulk of my business at Marriott, so it only makes sense to have the MR Premier Visa. Even if you don't primarily use Marriott, the card is a great deal. Guaranteed silver and one hotel night for $65.