I drive my Thiel 3.6's with an Aragon 8008BB, through Analysis Plus Oval 9 cables. This amp has a robust power supply, so that it doubles the current when the load impedance is halved, i.e., 200 watts into 8 ohms, and 400 watts into 4 ohms. It doesn't sound thin or harsh -- I've been pleased with it. You can find it used for $1500 or less, which is a lot less than you'll pay for some of the other units mentioned. You may want to check it out.
Good luck!
Good luck!