Group 2: 'Mid-Range' => Prefer to use to trade for other sketches of interest, but will sell certain ones at the listed $ value.
Group 3: 'Higher-End' Traders => Prefer to use to trade for other sketches of interest, but will sell certain ones at the listed $ value.
Group 4: MSA subsets => Prefer to use to trade for other sketches of interest, but will sell at the listed $ value.
Sketchagraphs Wanted in Trade or Sale
Below are some sketchagraphs / sketch cards that I would like to find to add to my collection. Of course there may be some sketches I am not aware of that may catch my fancy, so don't hesitate to ask, or make an offer . 
DCL Czop's - any that I don't have, that I may be interested in, esp. those in the table below !!
MSA Romita - any I don't have
MSA Sinnott - any I don't have
MSA Severin - pack pulled ones with a character I don't have, that I may be interested in, e.g. Executioner, Lockjaw, Silver Surfer, Watcher, etc.
MSA Tuska - pack pulled ones with a character I don't have, that I may be interested in
MSA storyline Ribeiro's for Amazing Fantasy #15; Avengers #1; Hulk #1; Fantastic Four #1; FF#4; or FF #12
MSA Dutkiewicz - any ones I don't have
MCC Czop's - any that I don't have, that I may be interested in
ML Czop Thor's, i.e. "non-common" pencilled ones
ML Punisher - preferably a Mhan since it is "lower value" than a Dillon
Topps Incredible Hulk (2003) - Any Czop I may be interested in ... preferably NOT an "extreme close-up" one like the Betty one that I currently have.
These are some of the specific sketches that I am looking for.