Depends on what you are trying to achieve. If you need lush legato strings - consider Miroslav Philharmonic. Also you can currently get Sonivox strings with a good discount. These have multiple articulations and are played with some kind of "rock attitude" for the lack of better description. Sonokinetic Ostinato Strings or NI Session Strings have unique phrase engines and are easy to use, providing great results. If you have ST3, there are some sweet strings too.