Next step in photography

After losing my dad's tripod I need to think about what my next major photography purchase will be.

Tripod or Flash

They are going to run me about the same amount of money. A tripod means I can shoot more landscapes, and a flash means I can shoot people better.

I am leaning towards the 600 flash, and would probably go for a tripod from the local Ritz. mmmr decisions decisions.