The first thing I would do is go and test the BH500 with a 2x10 cab, and also again with a 2x12, and see which you prefer, as they are very good amps. Youtube demo's can be good, but hearing them in person is always better, so i'll add in that if you can't find something you like in the shops, ask around on here, as someone relatively local may have what you want and allow you to demo it or hear it at a gig.
Liam