Hi Gav
Most people go for the larger reels when fishing 80lb. There are benefits with line capacity in deep water (unless you only jig in say 40m or less), larger drag systems and gears which will be more durable for you in the long term. That said, the 14000 and 18000 in the Spheros and Saragossa have the same size bodies, so the difference there is purely capacity between the 2 sizes. The Saltist looks like being a great mid priced reel, but daiwa supplies are pretty thin on the ground until January (we have sold out and have a waiting list). The Spheros and Saragossa are both superb reels in their price range but my preference definitely goes towards the Saragossa with its upgraded drag, and the big machined handle is much more comfortable for long jigging sessions.
hope this helps
Duncan