If you absolutely want a mic for BOTH situations, which I don't recommend, then I'd go with the Shure Beta 87C, which requires phantom power as it's a condensor. Link:
http://www.sweetwater.com/store/detail/Beta87C
You'd be better off getting different mics for different situations. For live situations, a Shure SM58 or Beta 58A are fantastic and can be doubled as hammers if the need arises. Okay, don't actually do this, but they are built like tanks.
http://www.sweetwater.com/store/detail/SM58
http://www.sweetwater.com/store/detail/Beta58a
For recording, the AKG C3000 B or Rode NT1000 are fantastic condensors, which, again, require phantom power. I've used the Rode (and if Blazingmonga ever finishes the HevyDevy Allstars, you can hear an example of vocals recorded with the Rode on the track I submitted) and it's a very nice, fairly inexpensive condensor. Since it's a tube condensor, it should be suspended upside down to prevent overheating. I haven't used the C3000 B, but I know that it's a workhorse and is a superb condensor.
http://www.sweetwater.com/store/detail/C3000B
http://www.sweetwater.com/store/detail/NT1000