As a player of the mod for 500+ hours and a player of the Standalone for 500+ hours I have to say one thing Frenchy... You wasted your money on the standalone. Luckily, you're reading this from the post of one of the the biggest DayZ nerds on these here boards. There is one thing that puts the standalone on it's knees and spanks it.
Arma2 DayZ: Epoch is an unofficial open source client and server mod based on DayZ Community Edition. Arma2 DayZ: Epoch Mod brings more RP to DayZ Mod with; Metals based economy, NPC Traders, Lockable Vaults, More roles, and more.
Arma2 DayZ: Epoch is set in a future time after the Great Infection. Humanity is slowly returning to the wasteland, industrious survivors have begun to join together in small groups and rebuild society. Small camps of merchants have started to pop up to do business with survivors who collect goods from the wasted remnants of civilization. Wholesalers have landed on the shores offering imported goods to aid the rebuilding effort.
All is not safe however some vestiges of infection still remain and rogue bandits still roam the countryside preying on unsuspecting survivors.
Survive, explore, build wealth, make your way through the harsh environment and assist in the effort to rebuild, or burn it all down its your choice, live in the Epoch.
Base building, Cars, Lots of guns, helicopters, traders. All in Epoch and 100% better than the standalone. I personally play hero, meaning I have no trouble giving some of my spare food to some guy who needs it. I don't KOS, I simply avoid if I suspect he's hostile.
EDIT: And in Epoch, one gun rules over all. The DMR. Mags are easy to come across, and can be bought a traders. If you find one of these, TAKE IT TAKE IT TAKE IT!!! :)One shot unconscious/bleeding, (below the collarbone) two for the kill. A player you don't want to pass by? Fire one shot into him, he'll get knocked out, breeze past him and wish him the best. Two if he is a confirmed bandito.
EDIT V 2.0 If you play epoch, know this chart by heart. This will tell you who will give you extra beans, and the ones who you want to kill ASAP.