It's really going to depend on what method you want to use. I think the "pound of each" deal sounds reasonable. If you decide not to use some of them, you could always resell to another hobbyist. The EI works for a lot of people, and seems to be simple and popular. I believe there's a modified version that uses less ferts, but I haven't been reading up on fertilization lately.
I only use KNO3 and K2SO4 (that's the potassium, right?), chelated iron and trace mix. I use Fleet Enema for phosphates. To be honest, I'll probably go with Tropica trace and Flourish iron when the dry versions I have run out. I don't do EI, I just sort of "dose as necessary."