Agreed. Buy the Naval Combat Pack. It's worth it for what you get with it. Plus, all the games on it are already patched to the latest versions and more importantly, you won't have to deal with a scratched up disk (Take good care of the new ones. Keep them in their sleeves
)
The only game that has any real issues in the Naval Combat Pack is Fleet Command because because of something to do with it's video drivers that they couldn't fix without rewriting a good portion of the game, so it crashes sometimes (I have yet to have a problem myself on my windows XP system).
For the Fleet Command game, be sure to download and install The Naval Warfare Project here:
http://forums.navalwarfare.org/showthread.php?t=66
It's like SCX is to Sub Command. It adds a lot more units and database tweaks for added realism. It's well worth the download.