Thiel CS3.7 vs WP8?


The 2nd hand price of Wilson WP8 is dropping down fast! I am thinking of buying a pair of 3.7 but as the WP8's price is almost within reach, I wonder which is the better choice? I have CJ premier 350 and Herron Pre. Now using Thiel 3.6 with very good results. Wanting the next step up!!
luna
PS: with regards to suggesting buying used, i meant it with regards to the Thiel 3.7s because by definition you will be buying used WP8s.
Thanks Cmalak for your constructive comments. I also believe I will not go wrong with the Thiels. My only other compliant with my systems is that it can sound too neutral. Has anyone tried 3.7 successfully with tubes?
My buddy has tried his 3.7's with a BAT VK55. This amp sounds wonderful but the 3.7's need more power to get the most out of them. He currently uses a Krell FPB-200. I believe Thiel recommends and uses Krell amps. Thiel is located right here in Lexington KY. If you want to email offline please do so and I can give you my buddies email and you can talk with him.
Luna...is your Herron preamp SS or tube design (i know they have both)? I would keep your CJ Premier 350 (excellent power amp with more than ample power to drive any speaker) and introduce tubes via the preamp if you are currently running SS. High quality, high wattage tube power amps can get pretty expensive. I think you can get better results of introducing tube sonics (bloom, fleshed out timbres/textures, etc...) via the pre-amp or even a tube-based digital source (CD or DAC). You will find a lot of threads on Agon that talk about this and advocate for a tube pre and SS power amp setup. Just a suggestion.
Cmalak has a very point. Tubes CAN get expensive in the higher wattages. The choice of interconnects and powercords also come in to play. Don't you just love this hobby...lol ;)