I am honestly blown away by your description of your A50's? Mine are great. Not the best phones I own, but really really good.
DT990's are nice to wear as well, I have the T1's which are exceptional, though I am thinking of selling them to make room for some of my other items.
The A50s don't seem to fit my head too well...holding them up to the DT990, I can see that they're substantially wider...unfortunately this means a lot of the clamping force is on my glasses and just tends to be uncomfortable over long working/gaming sesions. I've never been a fan of the cloth on them either!
I had looked at the T1s but at that price range I probably would've needed to get a decent DAC and AMP to get the most out of them. How are you powering yours? Any advice to a relative newbie?