Gortat is a solid piece. Thin out the guard ranks, throw in an undersized PF, and add 2nd rounder or prospect (e.g. Melo, Joseph).
Getting solid inside is key.
I'd trade Bass, Bradley, and Melo for Gortat in a second (and hope Courtney Lee comes into his own with us pretty soon).
Bradley is tough to let go, but for a true C that fits our precise need, it's worth it.