Thanks. I hadnt considered the blacklisting side of things..
I guess its something I will need to weigh up. I think I might get it all working (which may be a battle in itself) then see how frequenty I get bounce backs for dynamic IP... If its not that often then I will keep it as is, as I can still always send email through my hosts webmail. Else I will re-evaluate if its too annoying
Thankyou for your perspective on things..