you can try out engl in the belfast guitar emporium, mesa in reasound in cookstown, peavey in bairds in belfast, genz benz in banbridge (mac or 2 mac music, i forget which), and, sometimes, brunetti in portadown (mac 2 music or mac's music, now you understand my confusion).
I suggest doing that, lol.
bear in mind, though, those are expensive, and as 38th has correctly pointed out, most of these amps like to be driven- they'll still sound really good at low volumes (better than most solid states, IMO), but will sound a lot better loud.
how much money are you looking at spending? and what's your current rig?
problem is, high gain, tube, and quality = rarely cheap. you can get vintage-toned tube amps for quite reasonable prices, it's modern high gain that's expensive...
I agree for most part but SS amps can sound good in shops but might be cr@ppy once you turn it up, and vice versa for tube amps.
I agree. at shop volumes, ss/modellers will tend to sound better than they actually are, while tube amps will be short-changed...
also, when considering volume, unless your bedroom is the size of a shop, something that sounds "quiet enough" in the shop probably isn't!
Of course, it does depend very much on your situation... most high gainers are pretty high wattage, and that's loud.