Its a difficult but absorbing choice to make, I have only played through an Ashdown MAG 300 EVO 2 210 combo which was nice but very heavy and obviously less powerful, they do seem to be good amps, my first thoughts were that the features on the BH500 would come at the expense of something, you dont get something for nothing, but it sounds great to me and my only real comparison is with my previous GK MB210/MBE115 rig which the BH500 trumps in everything except weight .
My only criticism of the BH500 is that the tubetone becomes a bit too distorted and farty sounding after 5 but some may like it that way, its probably great for metal

keep it below 5 and its excellent .
I am sure that you will like whatever amp you buy, there is a lot of good gear available nowadays at reasonable price, far east production has ensured this, quality seems to be pretty good also .
Good luck with your purchase .