Really, Miley is going to be part of the rotation solution, and that is fine.
Free agency will be a tricky place to find difference making starting pitching. Price is the one guy, and he's 29 but will force you to buy a number of decline years (and surrender a pick). Is that worth it? You can go either way there. The other sexy names on the starter list have major question marks - is Jordan Zimmermann any good really, and is Cueto's arm going to remain attached to his body.
I actually like the idea of signing Lackey. Durable, knows Boston. Similary Mark Buehrle is useful on a short deal (Dan Haren less so, but still). If you want to take a short money flyer (with the modest expectations that come with it), could do a lot worse than Cliff Lee.