Honestly I'll take a Green/Lugo platoon for the rest of the first half, then Lowrie in the second half. Besides, do you really want this face on the jumbotron:
http://llnw.image.cbslocal.com/0/2007/07/24/320x240/images_sizedimage_205160655.jpg
Obviously depends on two variables: Lowrie and the acquisition. If Lowrie can bounce back in the 2nd half to be at least a league average shortstop, I'd probably stick with Lowrie at SS. It would save some money that we would have spent on 1B and we can use it elsewhere. Unless the 1B is a stud.