honestly, for me, CS:GO is NOT worth the 4 GB of RAM needed to play without lag and the large game size. I'd prefer the 2004 CS:S over this, but CS:S acted like crap on my 2006 laptop because it'd run at 3-5 FPS even on minimal settings and DirectX version set in the parameters to 8. It'd only get to 30 FPS when I stare at the ground. Literally. I can even play Half-Life 2 with little lag, if so, why not with CS:S?!?!?!
I still play 1.6 today on Zombie Plague Modded servers and CS:DeathMatch servers.
Usual loadout:
Pistol: H&K USP because the design is awesome despite its low damage
Primary:
SMG: MP5 because very low recoil, average damage and high firing rate
Assault Rifles: M4A1, deals a pretty good amount of damage, but don't like it because shooting while strafing makes things go crazy! which is why I have another A.R:
The Steyr AUG: good firing rate, and has a scope for medium-range shooting but low firing rate.
Terrorist side:
AK-47: Deals really high damage for a A.R, 25-40 damage dealt, and 1-hit-kill if headshot was dealt.
If I cannot afford the AK, then the Galil will do due to it's good firing rate, averge firepower and 35 rounds of ammunition.
Machine Gun:
the M249: My personal thought on it is it's got average firing rate (in 1.6, in CS:S it's got a realy high firing rate), amount of damage is that of an A.R, and a 100-ammo box which can make you a player who will provide cover-fire.
Snipers:
AWP: (Accuracy International Arctic Warfare Police): Extreme damage dealt, 1-hit-kill to any body part except for the legs, which deal 85 damage, but if you miss, you're vulnerable to getting killed while the weapon is loading another bullet in the chamber.
If AWP is too pricey atm, then the SG550 Auto Sniper will do, automatic firing sniper rifle, fast firing rate, and high damage output (2-hit-kill)
Snipers (if on the Terrorist team):
G3SG1: Very high damage output and an auto-sniper (and on 1.6 i can no-scope most of the time at close-distance combat because of it's high accuracy even un-scoped and running)
These are my opinions on my usual loadout and what I like about each of them and what I don't like.