Looks like O'Shaughnessy isn't teaching it in the summer.
Definitely take Holmes though. For the amount of effort I've put into her course, I certainly don't deserve the marks I'm getting. She is very straight forward, and it isn't necessary to use the textbook.
Just a quick google search and it shows Alexandra Gajic is teaching Macro. She is the current IA for both econ classes and has taught a few when profs are absent. She seems pretty good overall! (
http://www.macinsiders.com/showthrea...mer-61219.html)