Without question go for the Kobra. At that range the AK is devastating. The best way to take advantage of its strenghts is with some type of red dot. The kobra is russian, so is the AK, makes sense right? My 2001 SAR-1 is awesome with the kobra. Offhand shooting out to 100 yards, its fully capable of hitting a torso sized target easily. I have taken it one step further and have hit 6"x12" railroad tie steel plates at greater than 100 with it. You cant beat the kobra or other red dots for situational awareness either, both eyes open, full view of your area, cant beat it. Dont waste your money on cheap red dots, the recoil of the AK will break em all, belive me ive wasted hundreds on inadaquate sights, get the Kobra, then when you have the scratch get a 4x PSOP russian scope for when you want to take the weapon out further. The AK is often overlooked in the accuracy department, in no way am i calling it anything more than acceptably accurate, but i think youll be impressed. Remember, it was only designed to hit a torso sized target at 300 yards. Most combat occurs much closer than that (incidentaly so does most range shooting hehe). If you get the bird up your ass you might try mouting an EOTech in a scout mount setup on an Ultimak gas tube rail, but for that price you can get the Kobra and a russian scope. Have fun man. Enjoy the SAR let us know how it turns out.
AR's are more reliable than you might think, but remember, AK's are more accurate than you might think.