I'd agree that it does depend on the waters you're fishing and the style of fishing you plan to do. Personally, I would get the 8000s 'cos you'll end up regretting it otherwise. They are bigger in size than the 6000s I assume but it also helps with distance casting as the line comes off the spool easier, adding those precious extra centimetres I guess lol!!! I upgraded from the Shimano Aero RE 5000s to the Shimano Ultegra XTB 5500 mini big pits and the difference is massive!!! Good luck!