recomending power to speakers


I currently have a pair of thiel 1.5. I am also currently using a audio research d-60 amplifier for them rated at 60 watts / channel @ 8 ohms.

I see that in my speaker manuals the speakers are rated at 4 ohms (3 ohms min) Would this make my amplifier closer to 100 watts at 4 ohms?

Also, I do have the upgrade bug and realize my amplifier is the weakest link. What do you guys recommend as far as power linked to Thiel 1.5's I have tried them with tube amplifiers with terrible results.

Thank you,
tiggerpooh
Ditch the ARC. They are dry and lackluster with most speakers. If you insist on tubes go with high powered BAT, VTL or Manley. Good solid state amps for your Thiels are Pass or Classe. Krell and Bryton present the same dry sound as ARC so avoid them.
Speaking to Thiel they said that they mostly use Krell amps in their listening rooms. I know Krell is known for treble sizzle and a analytical sound...so it wouldn't be the first choice in my book. A better balance might be a sonic frontiers tube amp. the power 2 or 3? With the 1.5's you'd be fine with the SF power 2. It's a small speaker and if you're not in a huge room 100 watts will go a LONG way.
Maybe a pair of Odyssey mono extreme se's would fit the bill; give Klaus a call he may even have some demo or b stock which can save you some money for better cables or whatever else you may need.
Also the 20 year transferable warranty is a good selling point when the upgrade itch hits again and Klaus is one of the good guys in audio;like Ralph from Atmasphere.
I agree with the tube amp suggestions thus far and add Audio Valve from Germany.