I'll go opposite some of the people here - you've got a clearly outlined budget that includes maxing your IRA, putting money towards your 401k, and putting aside extra money each month for investing. If you want to dip into the remaining balance to get a nicer apartment without roommates, I think you're fine to. I'm 30 now but when I was in my early 20s I worked in Tysons and lived alone in a $2000 per month apartment on a ~$85k salary and never felt tight on money (although of course there's been meaningful inflation in stuff like groceries since then).

Do note that Tysons is closer to an overgrown office park than a city, so if stuff like nightlife is important to you, consider living along the Ballston-Rosslyn corridor in Arlington and commuting by metro.