As far as the Sixtino, I've had no real issues. Mine is about 1/3 stop off other meters. though. For average readings, I use the Gossen Sixtomat, which is a nice little meter. It has a screen for incident and does reflected. The one I have I picked up at a camera store in Regensburg for 20 Euros, and it even had a long gold chain.
Another good meter for spot metering is the SEI Exposure Photometer, but they run extremely high in price, as they measure down to 1/2 degree and were mentioned by Ansel Adams.
For the most part, a Sixtomat or Weston should be great!