Can anyone recommend any perticular supplements and protein shakes?

I want a regular multi-vitamian...(but there are so many kinds and variations and brands..ugh)...

I've been drinking a mega whey protein shake that has about 4 carbs in it, and 40grams of protein per serving. BUT no vitamians or anything else in it, and the taste kind of sucks. I get it from GNC, but I can't tell if I'm getting screwed or not. I pay $44 once a month, for 4lbs of mix that last all month. Is that average?

I was browsing around on netrition looking at their supplements (eck I got lost on that site though cause theres so many) and they have some shake mixes but they're like 2lbs and $25 each.. So it would end up more then what I'm paying now. So should I stick with what I got?

And I want a pottassium, calcium and magnesium (sp?) supplement, but rather take 1 multi pill for all 3... Anyone know any good ones and on the cheap side ?