Sorry about the last post posted before I was finished.
According to Dennis Purdy the author of The Illustrated Guide to Texas Hold'em the relative win rates for the top 25 starting hands are:
note I only listed the 25/169, these number were derived from computer simulation of one million dealt hands. by the way the bottom hand is 6-2(U) with a win rate of .2%
I use betfair's Hold'Em or Fold'Em Tool, which tells you the relative strength of different starting hands, and suggests possible ways of betting on them: Hold'em or Fold'em
it depends, if your jamming, calling from postion, on a tight table or a lag central.....remember your not just playing YOUR cards your playing with their perception of YOUR cards....