Heh, that's what you're supposed to do with dogs
Cats typically don't care if they're alone. But still, two is really not significantly more work than one, so it should be good
Just make damned sure they're spayed/neutered young. If one's male, you do not want to have to deal with him spraying (which some will do their entire lives if you neuter them too late). If one's female, you don't want her getting pregnant (which can happen within 6-8 months).