Honestly, all A levels are respected. The idea that some are better than others is a rumour. As long as you meet university entry requirements you can take whatever other subject you want.
I personally take Drama and Theatre Studies (which is different than just the Drama A Level) it can be fun, and it allows you to not just try acting, but to try costume, lighting, sound and set design instead if you wish. I personally chose lighting because I'm not a strong enough actor to get the grade I want in acting.
I also have friends who take Photography, and from what I can work out it is one of their most enjoyable subjects. Dance on the other hand seems to be a bit of a iffy one. In my college the A Level dancers have to work alongside the BTEC Dance groups, which means lots of frees have to be taken up by it so they can catch up with the BTEC counterparts.