Spanish D's (D Espa�ol) :P?

That's a great question. It's a matter of preference basically. The regular "d" sound, as sounded in English, is the more widely accepted vernacular. The "th" ending is heard exclusively of the Spanish of Spain. I've heard it as being described as sort of like an English accent for Americans; that is, it sounds more polished. In either case, it would be your decision to decide which you prefer. However, keep in mind that if you choose the latter, you must stay consistant. For example, if you decide to use the "th" sound for the "d" endings, you will also need to do the same for vowel/consonant combinations of: "ce, ci, ze, and zi". Hope that helps y buena suerte!