I'd start potting them now. And dig some more before you go as well.

Don't put too much in the pots--give whatever you're transplanting room to grow, so it doesn't suffer in the pot. And are there containers other than pots that will work as well? Cut the top off of milk and juice jugs, plastic bags that you can fill with dirt, etc. Don't limit yourself by the number of pots you can afford. But start by filling pots first.

I couldn't take my favorite plants with me. My ex is still in the house we moved to when we first got here. He has fabulous trees now--a sweet gum, baldcyprus, and Afghan pine in the back and an Afghan pine and my mothers-day yaupon holly out front. They're huge now, and I'm starting over from scratch with new trees I've planted. But the pine is getting up there after six years, and the vitex is a stunner. I have quite a bit more space here so I've put in a lot of trees. 18 months ago I put in several Italian stone pines--rated better now that Afghan pines (if they get too much water they have trouble, not so fir the stone pines, though both are great xeriscape plants).

But I digress.

Save some seeds also.

Good luck!

Maggie