I've seen most all of the TV HRs mentioned so far. My favorites I witnessed firsthand were McGwire's 60th and 61st in 1998. My son loved McGwire and we purchased tickets to those two games during the spring at his urging. The most impressive shot I ever saw was McGwire's blast off of Randy Johnson in 1997. We were in the left field upper deck and the ball sailed over our heads like a missile. I remember being stunned and then laughing when I saw my eight year-old boy wearing his A's hat and McGwire Tee-shirt dancing and pumping his little fists. Too bad that the PED revelations tainted it all. Oh well it still a great memory. By the way Johnson struck out 19, walked none, and lost on the way to setting a record for Ks in a game by a lefty.
The link below is to the video of that cartoonish blast.
http://www.youtube.com/watch?v=stUolWxG3wo&feature=kp