Two hobs or two jills, every year you must breed a Jill or get the Jill jab. If you're going to breed your own working line then you could get a male and female from working stock. You have plenty of time until May to get a new hutch and separate them if you need to.
Two males should be OK to live together but don't stud one out because after one has mated it won't be the same in the season and will probably fight.