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Most brands of lump tested at www.nakedwhiz.com Best of the West: http://www.nakedwhiz.com/lumpdatabase/lumpbag22.htm I didn't see the other two, but look for yourself. Whiz comes in here frequently and has one of the best web sites anywhere. Whiz tests everything from lump to stokers. He has one of the best web sites out there.
Of course you should buy all 3 and pick your favorite like I do, if it's not listed on his website.
I like to keep my target price at 50 cents a pound if I can find it that cheap. At least that's what I shoot for and gauge the price on.