Depending on your routes and days/times, Silvers can have a great upgrade percentage--including my upgrades for tomorrow's flights, I'm 22/24 so far this year (this counts upgradeable flights only, so flights on CO RJs or DL aren't part of the 24 legs).

However, you are based in Arlington, and there have been recent threads about how even Plats can have difficulty getting upgrades on flights into and out of DCA, so you should take into account what routes you'll be flying if upgrades are your main concern.

As pointed out in the first reply, there are other benefits aside from upgrades that might make Silver status worth an MR.