Koei Games

[BigBigFan]

Koei produced some of my favorite strategy games ever. I still play Uncharted Waters, PTO II and Aerobiz Supersonic from time to time and was wondering if there are any other Koei-heads out there who have all of their games? Which was your favorite? Do you collect them to play or as an investment? Koei games seem to continue going up in value instead of down even this many years later. How many do you own and which is your favorite Koei game?