You mentioned Egnater....I own a Tweaker 15w....it's a decent little amp, pretty loud for 15 watts, but it's like a "generic" version of the amps it tries to copy/imitate (Fender/Marshall/Vox)...yeah, it does sound pretty decent through a good cabinet, but again, it's kinda generic sounding to me...You might like it though, try one out if you're able...that's the bitch about where I live (waaaay back in the sticks), basically everything I get, I'm not able to try out beforehand...Some of the higher powered Egnater amps are better than the T15 (from what I've read anyway....never tried 'em myself)...
On the Blackstar, you might like it more than the T15, it's geared more toward metal/hard rock than the Egnater, but like Greg said, it's kinda "generic" too...I haven't tried the model you mentioned, but I did have an HT-5 combo for a while, & to me, it was ok, but nothing special...Even through a decent 1x12 Greenback cab, or even a 1989 Carvin 4x12 (with original speakers), nothing special....
I do recommend the DSL40 though if you can swing the $$$...The shared eq is really the only thing I don't like about
my DSL100, but it's a non-issue for me, as I only record...It's got more gain than you'll ever need on the red channel, & the green/clean/crunch channel sounds kinda like classic rock/older hard rock when you get the gain knob up on it....I'm sure it's pretty loud too, being 40 watts, but it's got a half-power switch that should help if noise is an issue...FWIW, my DSL100 when in 50w mode, is almost like a whole different amp, it feels a little different, & is a little smoother in the top end...In 100w mode, it's loud as fuck, but has clean headroom for anything you'd need, and I'm sure the 40w version is pretty much the same....
I'm a Marshall fan (obviously), but again, I highly recommend the DSL40 if you can swing the $$$ dude...
Let us know what you decide!!!