I vote the Saiga 545x39(300). You can find it really cheap from the Internet Gun Gods. Add one of the reliable high caps mags on the market and then a drop in phoenix stock(100) and boom: Saiga AK-74 for half the price basically. The surplus ammo for 545x39 is plentiful and has no kick. Then, tell your wife you made the build so she could come shoot with you. Winning!