Just going off of what we already have in-house, you could slide Lukes into LF, platoon Clement/Smith at 2B, and give Keys some DH ABs while Taters gets time in the corner OF spots. There's obviously room to upgrade, but SP might actually be the bigger need.
Cease and Soriano project as a #1 and #3, while Trey and Ponce look solid but with limited innings. Miles is a decent swingman, and then you've got the Spaghetti, Berrios, Bloss, and Francis slop.
Sounds weird after watching that anemic offense last year, and I'm definitely going to get tarred and feathered for this, but a good SP might improve this team more than a good bat. We don't really have a 5th starter but we do have some 2 WARish guys for the other spots.