Don't touch and AK-74
or Cur-II or SAR-2.
I had a Cur-II and a Sar-2 before I finally broke down and bought a SAR-1 a while back. I was spoiled by the fast, flat shooting, low recoil 5.45X45 round. Know when I shoot the SAR-1 it just doesn't feel right. Can't explain why though.
I think you'll find you have fun with though, cheap ammo and lots of fun. Once you've done a few mag dumps though keep your hands away from the forward sling attachment, it will be quite warm. Get's me on the SAR-2 and SAR-1 every time it seems.
Personally I like the 30 rounders, or even the 20 rounders from Tapco. Just a little more room when shooting from prone or from a bench. Have fun. You may also want to check out the Ulti-Mak gas tube and some of the Kobra red dot sights for it. Also a Tapco G2 or Red Star Arms Trigger group will do wonder for trigger feel.