Hi REH,
The category OGR is really diverse, so looking up info for size on the specific varieties that you want to grow will tell you whether or not you can keep them to the compact size you envision. Remember than in Sacramento a lot of roses will grow to enormous sizes -- far larger than they will get in places with colder winters and less sun. Some OGRs have similar care to hybrid teas, but other OGRs are once-blooming and should only be pruned after they bloom. Other OGRs (like many teas, for example) don't love pruning and prefer to only have dead wood cut away. I suggest doing some google searches on the specific varieties that you want to grow and seeing what other people say about how big they get in your region and how they like to be pruned.
