ENGL amps generally sound good at bedroom levels.

At the moment I play through Guitar Rig with headphones exclusively, as it gives me a better sound than anything I can afford right now.
I was just curious as to what's worth getting if I decide to trade up.

What's your budget? In my experience with a little tweaking (especially with the cab emulations) Guitar Rig can give a lot of really nice tones so buying a small 5 amp tube amp won't really be much of an upgrade.

Saying that, for the money the Blackstar is really good.

I don't really have a budget at the moment, as I'm saving for my wedding. I was mainly just interested to hear what's good for playing at bedroom volumes, regardless of whether or not I can afford to buy it at the moment.