Prince has had his moments, most notably that game vs. the Twins last month where he belted the game winning 3 run homer, but still is a little raw. People have to remember that he is still only 21 and, although I'm sure he'll do fine if Lyle gets traded, he still won't be as consistant right away as Overbay would be.
I honestly think he'll be traded, especially since Melvin has given him the "kiss of death" by saying he isnt going anywhere. Still I can see Melvin holding onto him if he isnt given a great deal because we really dont need to trade him. This isnt like the Sexon deal where we had to try to get something for him because there was no way we could afford him in free agency. So unless the Sox aren't willing to Overpay a little for Lyle (which I believe they will seeing as they have a legit shot at a championship) I could very easily see Lyle being traded.