Excluding tactical pic rail type systems- I really like the S&K SKulptured Bases and Kontoured rings. Lightweight, strong and good looking. The steel Talleys are also a great product, IMO. Both strong and look great on a classically styled rifle.
Having seen them break, I've zero interest in the Talley LWs anymore. Others have had better experiences with them, and that is great...
ETA: I just noticed your other thread RE: VX3 vs. Nightforce. If you're building a more 'Target/Tactical' rifle, my suggestions might not suit... If I were putting a Nightforce on a rifle I'd not use the Talleys or S&Ks.