Rear speakers with Beolab 50s

I am starting to consider getting a pair of Beolab 50s. If I do I will have an extra set of speakers. If I get the 50s I will need to decide what to use as rears. Right now I have 20s as fronts with wall mounted 12-3s as rears. If I get a pair of 50s, any opinions what would be best for rears? The 12-3s which are at a higher level being wall mounted? Or the 20s which are obviously the better speakers but seem a bit low for rears. Thanks in advance for any opinions.