I would prefer to keep Sessions. Our backup PG/SG is averaging 15 points per game and 4 assist. Rocking a PER of damn near 20/5. I won't speak for him and say he is happy in that role, but he sure isn't complaining.
He's 26 years old, on a really really good contract and he is happy (and more importantly really good at) his role. I think he brings a confidence to the team, gets along well with a rookie coach and has roots in the area.
Obviously if you get some crazy haul from another team he isn't untouchable... but I think he has more value here than he could realistically bring in. Plus I just think he seems to like it here, and I hate rushing people out who embrace us.