I too have a monopoly heifer that needs more frame size and has some power. I was thinking on breeding her to I80 and then depending on how she does with her first calf possibly breeding her to Yellow Jacket or One and Only for her second.
Just had a killer Direct Whiskey out of a monopoly first calf heifer! Came easy at 65 lbs. Direct Whiskey is working for us. DW just had reserve supreme heifer at OYE a few weeks ago.
I have a couple of monopolys and I'm going with Rumor Mill. I contacted Pat Wolfe (one of the owners) and it sounds he is working really good. But I also think direct whiskey and I80 or I67 (I80 short on supplies) would do the trick! good luck!