Those two rods should work very well for your purposes. If you're sure you want a sink-tip line for the 8wt, I would recommend an intermediate tip/ghost tip. This will allow you to both fish topwater poppers and hairbugs, but will allow clousers to get down deeper as well. The ability to fish surface flies for bass is too fun for me to give up.

Another option is to go with a full intermediate line which will work MUCH better in the surf. You'll need a stripping basket for river fishing, but a full intermediate line should allow your flies to get down just about as deep as a type IV sink-tip floater.

A multi tip line would be another good option for non-surf work. Cortland sells a system with floating, intermediate, fast sink, and extra-fast sink tips for $99. This sounds expensive for one line, but will save you the $40-$200 cost of an extra spool for multiple lines on the reel. [url=http://www.thefullcreel.com/files/index.php?id=214:6b5df]http://www.thefullcreel.com/files/index.php?id=214[/url:6b5df]

I would also recommend you give serious thought to whether you put an 8wt line or a 9wt line on that 8wt rod. In theory, you are paying for a fast action rod that would be slowed down by overlining. There are some great threads on this site discussing overlining that might be worth considering.