Newbie here, but wanted to make my firs post here in the Analog forum.
I think you'll benefit greatly by getting the TubeBox. I've played with a couple of $100ish phono pre before getting the P-J TB. Now I've upgraded to a better tube phono-pre, but sometimes I wish I had kept it. I'm certain that it will improve your sound to another level.
Also, you will have alot more options on your future cart. It makes more sense to me to upgrade the phono-stage before your Ortofon, unless this next purchase is going to be your last.