There's so many Spaghetti's to choose from. Many of those aren't really worth it I think. Better to check out the real classics first! Some minor ones added just for fun now and then
According to the Any Gun Can Play book this one's very good visually and, together with Keoma, one of Castellari's best Westerns. Sometimes reminding of Mario Bava. Story idea by Sergio Corbucci. It's OOP but I found a few places that still carry it.