I have these as my second system. They were in my office and now have them in my bedroom. I use a Jolida 10 watt tubed amp (model FX-10). I bought it for $450 and think it sounds amazing. You'd save a tun of money and I think you'd really enjoy the sound.
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If you can up your budget a little,there are 2 Rogue Audio Cronus integrateds for sale in the classifieds.I have heard this amp with Paradigm speakers(Monitor.Studio and Signature series) and the combinations sounded excellent.Remember,your other equipment,placement,room and other things all have an impact on the sound.Don't discount what a good pair of speaker stands can do for the sound.There is some maintenance involved with the Cronus but I sure wouldn't call it "high maintenance".Biasing the power tubes is easy with the onboard meter,change out tubes occasionally and that's about it.These amps react extremely well to tube rolling so you can tailor the sound to your liking.Go tohttp://www.rogueaudio.com/Products_Titan.htm and check out the stats on thee Cronus.Good luck in your search.
It doesn't appear that the Studio 20 is really designed for typical tube amps: http://stereophile.com/standloudspeakers/508para/index4.html.
Since you say it's a 2.1 system, I assume there will be a sub. I suggest you don't run the Studio 20s full range so that means you'll need an integrated amp that has both preamp out and main amp in jacks so that a bass management controller can be utilized. NAD integrateds are the obvious choice. The Creek 5350SE is another choice.
I had the Studio 20s with an NAD 744 receiver and an 80 watt tube integrated. While there were definite improvements in some areas with tubes, the overall sound was more balanced and satisfying with the NAD. The 20s are excellent speakers, but definitely dip into 4 ohm territory, which is not the strength of tubes.
Kiza, no disrespect intended, but 60 Hz may not be considered bass to everyone.
From here: http://www.soundstagemagazine.com/measurements/paradigm_studio20_v3/ note how the distortion begins to rise rapidly below 150 Hz. The 20 definitely could use the support of a subwoofer. This should come as no surprise, but check out that very impressive frequency response.