Is Casey Kotchman our best bet at first?

As comprised today, Boston has two choices when it comes to filling it's first/third hole: Slide Youkilis over to third and commit to Nick Johnson as first-baseman... or leave the window open for Beltre with the expectation that Kotchman ends up at first. The question is: Is Nick Johnson appreciably better than Casey Kotchman based on actual value? To me, it's a rather simple answer: No. Casey Kotchman is the better option than Nick Johnson.