Gigandas or Corona Spagna are productive if we have a nice year, the Painted Lima beans that Pennard Plants sell is very very nice too.... you're a bit late to get Gigandas started though, they need a long season to really crop well (I'll be growing a few indoors this year), also can I point you in the direction of some of the shelling french beans? Yin-yang is easy to source, but Ernie's Big-Eye is great if you can find it, as is Cherokee trail of tears, and POlish climber will give you a Borlotti type bean six weeks before Borlottis will....