1) Barret & Gold Deagle, with bandolier, stopping power, deep impact, and a smoke grenade
2) AK 47 w/ RDS, gold deagle, RPG, juggernaut, conditioning & a flash grenade
3) M1014 w/ grip, gold deagle (see a trend in the pistols?), juggernaut & conditioning, with a flash grenade
That's all I really use. I start most maps with the sniper rifle, and if I can't get any good sniping done, I switch to the AK unless it's a small map. Pretty simple.