Yeah I reckon its good to have headphone choices, after all, no matter how good your headphones are, its nice to have a change. I almost wished I had kept my DT531's but up until that point they were collecting dust, and I wont have money for another set for a while. Besides, my preferences are about 90% electronic, with the other 10% rock, female vocal and pop, and I've found nothing much that can do any better in those areas.
I am not really surprised that your RA1 beats the OBH21, as you may gather from my posts, I am not really a fan of the Creek amps - they work, but I wouldnt go so far as to say they were good performers, but anyway, enjoy it, and remember, theres far more difference between cans than amps, so dont stress about it.