I would suggest we run it without mods to begin with.
I usually run the Combined ops, which is the running stock ArmA2 and the expansion Operation Arrowhead together. But if everyone does not have that, I'll just run plain Arma2.
@BA,
I think you'd like it, it is a very tactical shooter, and you definatly need to keep your wits about you.
To illustrate it, think of a smallish town situated at the foothills of a wooded ridge. You and 5 other guys are slowly advancing through the treeline, with the rumble of tank-tracks in the background. You spot a small MG nest with a few armed men around it. You and your squad set up you attack and get into position. You quickly look around as the first shots are fired and the gunner of the MG nest if hit in the chest and slumps over. The men around it suddently take cover and try to find the direction of the fire. They spot your muzzleflashes and return inaccurate fire. By now, the entire town knows where you are and you hear the distict sound of a BMP engine start up and soon you hear a few 30mm shells explode nearby. You and your squad takes cover at the edge of the woods in a slight defilade.
You are still under fire, and unable effectivly to return fire as both high calibre autocannon and rifle-fire supresses you. The man next to you readies a M136 rocket and launches it very quickly at the BMP as you consult your map for calling in fire-support. You give a coordinate for the 82mm mortars 2 kilometers south of you and within 10 hectic seconds the first rounds land short of the target, you again report an adjustment to the mortar team ,and shortly the BMP and the infantry around it explodes from the barrage. You manuver through the town and clear it house by house, peeking around corners as you move.
At the edge of the town you suspicions are confirmed, a Shilka is rotating its radar looking for airtargets. Another man in your squad knocks it out with an AT4 (m136), clearing the way for the airsupport. Which is greatly needed as you see a counterattack shaping up as three T72s with infantry support are coming down the road 2 kilometers north. You bring up a laser designator and you announce on comms you are marking targets. An AV8 harrier piloted by another guy on comms drops a laserguided bomb on your mark and it soon impacts the first tank, cooking off its ammo store.
That is essentially what a ArmA session can be like.