Bridgestones 016 pro , a good all round road tyre, not expensive as you say and does the job, they may not last as long as the 21,s but who cares, as soon as the tyres start to wander , its time to change them anyway. I always buy in pairs, none of this two rears for one front . They are a bargain so use them and change when they start to go .
I use them on 4 bikes and like the set up. Heaviest use is the ,Blade, never get more than 2K, so its a new set every year.
190/50 v 190/55 , the taller tyre rises the ride height , on road riding you will probably never use the edge of the taller tyre, Why buy rubber you don,t use.
Only my opinion mind, we all have preferences