http://goallineblitz.com/game/game.pl?game_id=219759These were my numbers... 65 strength, 64 blocking, 50 speed, 67 agility, 49 vision. My pass block SAs were 2-2-2-2-1. This was also with +pass block focus. My back-up has worse attributes but better pass block SAs, namely 5 in protector.
I did, however, call plenty of plays with extra protection (either a TE or RB left in to help block on almost every play, sometimes two extra blockers). We gave up two sacks to blitzes, but there's not much that I could have realistically done to prevent them.
The DE that I faced has over 50 sacks on the season (second best in my league, the league leader has over 70).
150 isn't a magic number IMHO. Even though I was playing LT in this example, the 1 in protector from the CE bonus wasn't tide changing. Granted, I did need some help from the TE and RB to get the job done, it got done. I was also out-leveled by the DE and he's one of the best in my league.
Personally, I think speed is over looked in your equation TBPH. You need at least 115+ speed and agility to get position (45 speed, 70 agility seems adequate with the proper blocking focus). You also need enough blocking to keep the DE locked up. Plus, you need enough strength to not get pushed into the QB by a strong DE. Lastly, you need enough vision to take the right angles and not block the wrong guy.