Which mics in particular are we discussing? Because some that claim to be Neumann clones are absolute rubbish, while others that don't might be a good fit for your voice.

Most budget Chinese condensers have a nasty distortion problem in the high frequencies. And most mics that claim to be just like a Neumann, well, they really aren't like a Neumann at all. But there are a lot of mics that sound great anyway for a lot less money...but it's hard to find a large diaphragm condenser (LDC) of GREAT quality for under $600. There are some marvelous mics being made by Peluso, Wagner, Bock, Mojave and Bees Knees. Another excellent option is to have Michael Joly of Oktavamod.com take your cheap Chinese condenser and transform it into a very nice, musical, balanced mic for a modest investment.