I upgraded from the Shure SM-58 I have had for years as a stage mic to a condenser. With the budget I had, I opted to get the Rode NT-2A condenser mic.
Since I have limited funds for my studio gear "habit" I have to use this one mic for literally everything. I use it on acoustic guitar, mandolin, both male and female vocals, and even on my guitar amp. Personally, I think it does a fine job on all of it. Sure it might be missing some subtle flavors of some of those things but to my ear... it works fine.
You should be able to grab a really nice all around mic in the $400 price range. I know, I did.
Also, be sure to get a pop filter with the mic.