V2 and V3 are sonically very similar. The v3s may be a bit smoother where the v2 a little more forward in the treble. The 40s image better than the 60s but obviously have less authority at the bottom. All the Studio series offer a lot for the money. IMO they are a solid buy. You will need a good front end and authoritative amplification to bring out their best.
Comparing Paradigm studios to Signature B & Ws is not exactly apples to apples. Not only are the Sigs sonically superior they are many many times more expensive. You would be better served auditioning the CDM or 700 series from B & W. However, they will be approx. 25% to 50% more expensive than similar Paradigm studios, but nowhere near as expensive as the Sigs.
If your budget runs from B & W Sigs to Paradigm studios…there are tons of great speakers to chose from. Silverline, Dynaudio, Meadowlark, Soliloqy, Von Schweikert, Joseph Audio, Green Mountain, etc. etc.
Listen to as many as you can.