Killzone 2 Classes. Which will you play?

I'm sure you have all seen this already but I'm curious as to which classes you think will fit your style of play. I've read that you can mix primary abilities of one class with secondary abilities of another. I'm more of a run and gun player so I'll thinking some mixture of Assault and Saboteur. Of course this subject to change once I actually play the game. Anyway, here is a description of the classes:

Rifleman:
The default multiplayer character is assigned when no primary badge is selected. A secondary badge may still be added. Riflemen can start with most weapons, except for the specialized ones.

Engineer:
Primary badge ability: Sets up an automated turret which targets the enemy.
Secondary badge ability: Repairs ammunition dispensers, mounted guns, and automated turrets.

Medic:
Primary badge ability: Revives downed team mates.
Secondary badge ability: Throws a health pack, which can be picked up by other players.

Scout:
Primary badge ability: Uses a cloaking suit to become near-invisible.
Secondary badge ability: Tags all on-screen enemy players with a hidden marker, which broadcasts their coordinates to team mates.

Assault:
Primary badge ability: Dons heavy armour twice as strong as normal.
Secondary badge ability: Temporarily boosts running speed.

Tactician:
Primary badge ability: Throws a coloured smoke grenade, which serves as a spawn point.
Secondary badge ability: Requests air support from a sentry bot which targets the enemy.

Saboteur:
Primary badge ability: Assumes the disguise of a randomly selected enemy player.
Secondary badge ability: Throws a sticky, proximity-activated C-4 charge.

Here's a great video to get you excited. Check out the AI at 2:14....

http://www.eurogamer.pt/videos/exclusive-killzone-2-gameplay-pt-2?size=large

Scout because i like sneaking around invisible which is why i play spec.

engineer primary (having aid on the battlefield)
saboteur secondary (cause i love it when stuff blows up!!!)

Primary Medic-Revive team Mates

Secondary Scout- Show enemy locations

That kit would be a really useful squad member

primary: taction
secondary: medic
basically great for defense

Any vehicles?

Not in multiplayer.

In the main story line there is one tank and a Metal gear style exoskeloton.

Interesting perk system chart: KILLZONE 2 PERK SYSTEM CHART

Assault. I think my style will always be run n gun.