I dont think that you will go wrong with any of the guns you have mensiond in your post. It all depends on how much you want to spend and whether you want a new gun or not.Personally I like the Daystate huntsman and the S410 the most but you would probably need a charging kit aswell as they only fire full power shots in between fills
Just watched a few clips on you tube of a jagd terrier, I saw clips of them taking down bore, badger and fox. Had a look around the net see if I could find any for sale had no joy either ATB with your search mate