Well, it's certainly interesting, but I think we all need to know a little more before we can help you. If you can't keep A-Rod, who out of whom you will receive would you be able to keep. Also, are you playing for this year or next? If you're playing for this year, post your lineup so we can decide how well your offense can absorb such a huge loss.
If you want, post this information and reply to my thread viewtopic.php?t=412733
I'll then reevaluate the deal based on new information.
For now, I'll say it seems like a fair deal. Just realize that it's not that you should be afraid that A-Rod might "take off." He will take off; you just have to come to terms with that.