Instead of the 4000, go with the 5000. They are the same reel, but the 5000 has a deeper spool and more line capacity. Check the Shimano Website, the Stradic FH 5000 is listed slightly lighter than the Stradic 4000 FH.
Currently, I'm using a Stradic 2500 FH and it has performed flawlessly. A big improvement over previous versions of the Stradic.