I have pretty good mic collection going. I bought them all off e-bay. I know you're always taking some risk purchasing something used. Look at mics that state, "like new", "only used 5 times for recent project" etc.
I would never pay $200.00 for a $200.00 mic.
That said, for a very nice multi-purpose (not to mention very cool looking) Large Condenser that could be had for $200.00 (maybe cheaper)on e-bay I would say the Blue Bluebird. I'm very pleased with mine.
For a real step up from the Sennheiser, you would probably not regret purchasing a Heil PR-30. Again a very useful dynamic great in a variety of applications. You might check used prices on The Shure SM7, EV RE20, and Sennheiser MD 421 (other mics in this genre).
There are certainly a lot of other options. These are just 2 that have worked for me. Recently just purchased an ADK TC tube LDC (around $600.00 new) for about $200.00 on e-bay. Definately a big bang for the bucks. Superb vocal mic imho.
Just food for thought.