I just tryed the SVD m2 Sniper Rifle... Very acurate when fully upgraded... but you will get it later in the game, this is why I like Vintorez. RP-74 is very strong: 3 bullets and a stalker is down. Badly, you will get it later too... and this happens with the most good weapons.
I use the LR300. I haven't had a single jam with it once yet. Deadly accurate with a SUSAT. I love it.
H&K G36 is probably my choice NATO firearm. But since you can't get one for a long while, I'd go for a SIG 552.
For Russian Ordinance, I always seemed to have less jams with the AK-74 over the Abakan, and therefore preferred it. For 9x39 firearms, The Vintorez is an undeniably deadly weapon, but I was always more of a head-on assault approach-taker than a sniper. For that reason, I usually go with a VAL.