Get what you like and what you can afford. I know that having too many options can be worse than not having enough. Bascically, if you want a cheap protein mix, use whey concentrate and casien with sucrolose -- that's what most commercial brands use only it'll be a lot cheaper. Throw in a bottle of DX7 and you'll have a great MRP. (You can use a half dosage of DX7, it'll last 2 months. ) As for formulas, BIG BLAST is the shit. Everything else is pretty much a basic protein blend.