Why would you want to use a condenser mic live? Are you assuming it would somehow improve the sound? If so, here's a wake-up call for you. Upgrading just about everything else in the signal chain will have a far more dramatic effect on the quality of your sound - and using a condenser without FIRST upgrading EVERYTHING else is kinda like pouring perfume on a pig. There are a few handheld condensers made for live vocals, but I think your money would be better spent on better : mic pre-amp(s), compressor(s), EQ, speakers, crossovers, cables etc. etc.
Unless you're talking about classical concerts, live performances are all about poor acoustics, noisy environments, inferior or compromised equipment and so on. The reason the SM58 has been the premier vocal mic for the last 30 years is because it can cut through the mix no matter how bandwidth-limited the PA is - and without having an extended high end or fast transient response. (BTW the extended highs and fast transients that sound so great on condensers in the studio will either get lost in the relatively poor sonics of most live PAs, or cause screaming feedback...or both).
I'm speaking from experience as a former touring FOH engineer working everything from clubs to stadiums.
Scott