No bad option there, and being realistic, not much of a tradeoff. I've used other TTSXs and the 30 cal 180 Partition and been very impressed. I would go 180 Partition with the -06. Just because its a great blend of ballistics and terminal performance. I've always wanted to build an -06 just for that bullet.
As an aside, comparing SDs of a mono and the Partition is not very useful. The monos retain SD as they penetrate whereas the cup and core style bullets lose SD dramatically as they shed weight.
