The reality is there are a bunch of good Ohlde-type Angus bulls that can work. We have a limited amount of Ohlde blood in our herd, but are getting pushed from the commercial side to use more and more of it. We are about to sell every crossbred bull we have and replace them with Ohlde type Angus bulls, possibly some Jupiter sons, to use one our crossbred cows.
We currently own one - an Anchor son out of Griswold's OCC Primrose 932L cow (a Just Right daughter). He has worked wonders on our crossbred cows and just makes beautiful daughters - that grow out to just about an ideal size for us. So, we are about to dive in head first with these genetics.
To use on crossbred females, I'd recommend one of the purebred Angus from Ohlde/Griswold/Duff/Limestone. To use on purebred females, you'd probably get a little more power from a bull like Copyright.