I currently have in possession a 5006e Prestige and a 1206e Premium. Many of those who say the mid level SR500 & 700 models are not much different haven't even played the premiums and prestiges, except maybe in a store for a few minutes. I had a SR506 and I can tell you it's not in the same ball park. It's not even in the parking lot for that matter.
One suggestion though is try a premium as well; SR1200 & 1400 series with the Nordy singles. I'm really having a hard time deciding which one I'm going to keep . . the prestige or the premium. Both have advantages. If your into Jazz, a lot of studio work, chords, technical, etc., definitely go with the Prestige. It has has a subdued, thick, smooth, refined sound with lots of clarity. The dark wenge / mahogany combo is simply stunning. Probably one of the coolest, most unique looking production basses out there. That's where a lot of the price tag is at.
If your playing live, slap, rock, funk etc., the premium is the way to go. It has an aggressive, in your face. professional sound. I wish I could keep them both.
Not sure why but Prestiges do take a hit on resale (I'm glad I bought mine used) so I suggest doing the same. But, I played a lot of $2k basses. The prestige was just as nice or better. There's a lot of buzz on TB about the 1200 series. I could see the resale being better on those.