I didn't like CC5 because there wasn't enough tanks. It's a big blood-bath with infantry. I liked CC3, however, I didn't like the fact that your performance has absolutely no effect on future missions. Except the kind of equipment you can buy. Also I thought the campaign was too short and too easy. I used to be a big fan of Close Combat but then it just got too boring. I think the replay value is a bit low.
I should try Steel Pathers and Panzer General. They look like more challenging games.
Home of The Underdogs has CC1 and CC2.
http://www.the-underdogs.org/game.php?gameid=4107
http://www.the-underdogs.org/game.php?gameid=4099