So, I've been looking around a bit, since the band I've been jamming with for three weeks have recommended getting a powerful Tube Amp (they say it will make it easier to find a band, and I won't have to rent gear for future gigs), but I have absolutely no clue what to look for! I've heard good things about Marshall Tube Amps, and even managed to find a powerful one within my own budget, but I'm not quite sure if it's worth the money.

It's a Marshall 6100 Anniversary Limited Edition Tube Amp Head with an analog foot-controller and a matching 4x12" cabinet, with all together goes for 5000DKR, or roughly 700-800USD, so it's not that expensive, which leads me to believe that it might not really be such a good Amp anyway, despite getting 9/10 in some reviews I found.

I'm probably just overly paranoid, but that's just me in a nutshell. But I'd rather get a great Tube Amp that can work for years or decades, than a mediocre one that needs to be replaced with a better one within years.

Does anyone know this Marshall 6100 Anniversary Limited Edition? And are there other great Tube-Amps that won't cost too much? The only requirements are that it is powerful, and sounds great.

P.S.: I found the Amp mentioned on a Danish equivalent of eBay (I'm quite sure it's even a Danish sub-section of eBay). I haven't been able to find it in any stores yet.

I've also heard that Fender, Mesa and Vox should be some pretty good brands, but I mostly only see people using Marshall during concerts, so that's why I assume they're the best Tube Amps.