As a die hard ranger fan, i'll tell you that jagr has not been comfortable with who he has played with so far, a rookie named Brandon Dubinsky, and Marcel Hossa who is a Healthy Scratch quite often. With Straka coming back his numbers will improve, i would try to wait him out if i were you. sedin could keep up w/ jagr as far as PPP go.
if it depends on your goaltending i think its a better trade, but I don't think thomas is all that great, plus he splits time with Manny Fernandez. See if you can pick up Bryzgalov from Phoenix if hes free.
Plus don't forget, you're going to have to drop another player in return unless you have an open roster spot, and if tim thomas isnt' better than the person your dropping, i definately would not pull of this trade.