I do like the Argent discs, but their menu system with an overly long movie clip is a little annoying, so I usually end up watching the other DVDs I have of those films.
Also nearly forgot, the Japanese SPO DVD of 傷だらけの用心棒 Cemetery Without Crosses has been re-released by Japanese label ANEC (as mentioned elsewhere on this forum). A really terrific film, and the new disc is the only readily available legit way to get to see it. Can be purchased from Yes Asia for under £20 all in (including postage and tax worldwide).
Sounds like you have a pretty cool Spaghetti Western DVD collection already TheBigSmokedown