wow these are totally different beasts. Your going to be completly changing the sound. Thiels are strong, dynamic, fast, detailed and have a great sounstage (the total opposite of vandersteins which are reserved, laid back, slow, and warm) I would recommend the 2.3's instead of the 3.6's. The 2.3's are smaller but are newer and many feel are better. If you only like classical you may not like the thiels though and it's a pain in the butt to match gear with. They can be bright also if you don't watch what your pairing them with. This will be a drastic change I really recommend you listen to them first. If your looking for a great soundstage and imaging you can jump into and totally immerse you than thiel is the way to go. If you like that syrupy fix it sound than go with some bigger vandies.