I'm still confused on the best strategy for the old exotics. I am currently working on pocket infinity's bounty(just need 4 more fusion rifles), so if i have things right then i should not level it at all and then wait till xur is selling the new model but that and then break down my old one for the shard? or would it be better to just use it and upgrade it and then just start fresh when xur is selling and spend the strange coins for the shard?
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Xur will take the old one and give you the new one. It will cost 1 shard and 7000 glimmer to do so. I suggest not completing the bounty until DLC drops just in case they give you the new model.