With a decent condenser mic you wont need a preamp. You should get a clean clear signal nothing added nothing taken away sent straight through. The secret is the post record editing. I would concentrate on the quality of the mic and look at post record plugins rather than using hardware to boost a mic not quite up to the job. I have another thread where there is a link to a tutorial on plugins and how to use them.
http://www.jpfolks.com/forum/ubbthreads.php/ubb/showflat/Number/740938#Post740938