I can see where you are coming from. Choo does not give you what ALR gives you in terms of power. I'm projecting Harper to have a "middle of the order" bat next year, and with Desi behind him, I don't think he sees just junk.
However, I have a limit on how hard I'd chase ALR. 2 years plus an option, AAV of $14 MM over the first two. Something like $13MM - $13MM - option of $13MM with a $2MM buy out. I'm not sure that gets the deal done. Prices him as a 3 WAR player, which is a level he had never hit until last year.
Kubel might give you the power and could bat down at 5th or so. He's consistently bad defensively (Choo's 2012 might be an aberration), but should be cheaper.