Meh, this is like my 3rd climb, and I'm STILL not sure how to stat.

I went first 20 into vit this time and last time. That worked out very well. The extra life is a huge help.
So that puts me at 60 base vit.

After that, I just go str all the way. I'd put dex in, but I don't know how much I need.

After gear and everything, what is a nice dex to have, before I start putting points into Str?

Go for at least 120 Dex. Then All Strength.

I go 50 Vita. But if 60 is working for you keep doing that.

Normally I would do 125 dexterity, pump rest into strength. On HC though since I started, I put enough to reach 110 dexterity and pump strength without touching vitality. It all depends on what you are comfortable with and the gear you will be using.

I say Keep doing your vita like that
Then get 100 to 120 total dex@lvl55(if your using a axe u want less dex)
then rest into str

If this is SC, points on rogue into vita are a waste imo. MAYBE first 5-10 but no more.

Pump dex up to 120-130 fully equipped, and rest strength.