The Spiders are pretty much famous for being crap amps, as are the MGs. I also have the 100dfx and can vouch for that...
Plus if your looking for a good tone with a few pedals or whatever, you don't need a modelling amp to the effects for you.
I highly recommend stretching your budget. You'll be alot happier in the long run. Also be aware with tube amps that as you raise the volume on them they go into overdrive, so the tone you get at a low volume in your bedroom won't be the same as what you get at high volume.
You could get an attenuator with that, but that's an extra 300 euro.
Most people say that tube amps are better than solid states but it all comes down to the amp itself, there are many solid state amps that are better than tube amps for the same price. Avoid "Hybrid" amps too. They only have one valve in the preamp which doesn't affect the sound that much, so it's not going to sound that different to a solid state. Of course these are only "rules of thumb" so try whatever you want buy.