Hi @Stefan87,
In your list :

The only ones I know are the AC15 and AC30...
I did not found the AC15 terrible, but it was the 1st RI generation, and I suppose that they improved since.
As for the AC30, they are not what I would call precisely a small/medium gigging amp, just by the size and the weight !
Returning to your list, I would consider the DR ToneMaster and the Roland Blues Cube in the "recent amp category" for their features and lightweight. That said, it's purely personal and I never tested one ! But I should...
For gigging and reharsal, I use 15-25WRMS tube amps such as my late 70s SF PR and DR, and my DIY productions, all in combo form and fitted with a 10" or 12" speaker.
As you can see on the (awfully poor quality) following pictures from July 2018, I use a 1x12" 25W combo installed on a slanted amp stand beside me :
I had way enough power to play Santana's Soul Sacrifice (we were in a Latino-Funk era
) and any other of our tunes, the amp staying clean, or at worse reaching the onset of "sweet spot", but I'm even not sure... 
Our band is not really a small one
, and is rather loud in itself by its composition
(though our keyboardist was missing that day
unfortunately
) :
All this to say that already a 15-20W amp should be convenient for you for gigging in any venue, IMHO...
A+!
In your list :

The only ones I know are the AC15 and AC30...
I did not found the AC15 terrible, but it was the 1st RI generation, and I suppose that they improved since.
As for the AC30, they are not what I would call precisely a small/medium gigging amp, just by the size and the weight !
Returning to your list, I would consider the DR ToneMaster and the Roland Blues Cube in the "recent amp category" for their features and lightweight. That said, it's purely personal and I never tested one ! But I should...
For gigging and reharsal, I use 15-25WRMS tube amps such as my late 70s SF PR and DR, and my DIY productions, all in combo form and fitted with a 10" or 12" speaker.
As you can see on the (awfully poor quality) following pictures from July 2018, I use a 1x12" 25W combo installed on a slanted amp stand beside me :

I had way enough power to play Santana's Soul Sacrifice (we were in a Latino-Funk era
Our band is not really a small one

All this to say that already a 15-20W amp should be convenient for you for gigging in any venue, IMHO...
A+!