From: Leeuwarden, Netherlands
Have to agree with VPaulus here, any choice you make be it PC vanilla, the DLC's or the AK expansion... all worth their money. Loved the original 15 years ago, love it still. Yes it's a safe start, easy to grasp and easy to play and loads of fun.
At some time you probably will want to play some "deeper" wargames, after you've played this one to death. Best thing to do is read the AAR's in the subforums, if you like the feel of a game and like the AAR then most likely the game will suite you. Spending money on a game is always ... trickey? You honestly don't know how it is untill you've played it a for a few days, maybe a few weeks even. Sometimes it's wasted money, more often it's not if you choose carefully. I do make occasionally bad choices too, play them a few hours and they end up on the shelf, it happens. Not so with PC though, bestest buy in a long time.
AT or ATG is a good choice too though, deeper and much more complex, endless replayability, loved it since it got released in 2007. The Decisive Campaign series add more historical flavor.
War in the East and its upcoming sequels and TOAW are good choices too, maybe a bit too complex for the moment.
Over at Slitherines the PC forum is a bit more active, more topics and more mods there.