I'm thinking about going for the Heirloom 4 Sided Vintage Style Paddle Strop Combo (3 sides for paste, 1 side leather). I want to keep my one straight sharp w/o having to send it out. I don't intend to buy any other razors or stones etc. I'm pretty simple. Will this do? If not, what will? I'm just going to make one purchase in this area and I want it to be good.

What 3 grits should I get out of: 3.0, 1.0, 0.5, and 0.25

Thanks!