Here is a list of the more valuable die-cuts. Prices given are approximate, based on what I've seen them sell for in the past year or so. Ranges of prices do not reflect the full range I've seen, there are always anomalies, the ranges reflect the bulk of the auctions, and also only reflect the prices of cards in very nice condition.
 
The non-repeated titles:

#1      Boredome's            $50-$75
#2      Fearstone             $50-$75
#5      Campy Spider Soup     $50-$100
#6      Slum-maid Raisins     $50-$100
#11,38  Cracked Jerk          $25-$50
#14     Alcohol Seltzer       $35-$50
#15     De-Mented Tomatoes    $50-$100
#18     Schmutz Beer          $50-$100
#21     Moron Salt            $50-$100
#23     Muller Beer           $50-$100
#32     Ratz Crackers         $2000-$3000
#37     Coronation Milk       $50-$100
#38     Cracked Animals       $2000-$3000
#43     Jolly Mean Giant      $75-$150

The number-variations:

#2     Duzn't                 $75-$125
#5     Chock full of nuts     $50-$75
#6     Grave Train            $100-$200
#15    Skimpy                 $75-$150
#18    Quacker                $75-$150
#21    Jolly Mean Giant       $500-$1500
#21    Maddie Boy             $100-$200
#23    6-Up                   $150-$400
#37    Breadcrust             $25-$75
#43    Maddie-boy             $100-$200