Hi Pierre, have you considered Hartke?

I bought this one from this supplier about 8 months ago as I was looking for something similar to Peavey TKO and this looked closest match. Don't be fooled by the 12" speaker, this thing is quite a large cabinet (looks like it houses a 15") and very loud. http://www.ebay.com.au/itm/Hartke-HD...-/391432085202

In hindsight the 50w with 10" speaker may have been adequate... http://www.ebay.com.au/itm/Hartke-HD...gAAOSw8vZXL~zz

Kick Back styles look good but you pay extra for that feature where this Ampeg one seemed to have the best reviews for the budget you mentioned....http://www.ebay.com.au/itm/Ampeg-BA-...EAAOSw0vBUaYa4

I had curiously looked at Joyo all valve amps for guitar but the sound clips on YT don't help too much and made them sound less than desirable.

Hopes this helps somewhat.