Sounded awesome when I read about it online, can't run it, says fuck it, but deep down wants to try it out after upgrading my computer. =)

Do you think its worth it to ditch the game I'm playing now and to use the 2009 mod?

How long have you been playing it for?
Also, perhaps savegames are compatible? (usually not, but worth an ask!)

Oh, don't get me wrong, I have the game, and love it, but the fact remains that games which REQUIRE mods to function properly are going to miss a lot of potential sales.

Uncertainty is a good thing - it would be pretty boring if you could rely on finding the same stuff everywhere you go (Fallout 3). What got me, though, is that it seemed like it was a bad idea to go off the beaten path at all, with supplies being as limited as they are. If I've only got five clips for my gun, I don't want to go after anything non-essential, because I know I will almost certainly take a loss I can't afford.
Is that how it is through the whole game, or is it more like Fallout, where you're starved at the beginning, but drowning in ammo and medical supplies after a few hours? I think System Shock 2 had very well-tuned resource management - as long as you were careful, didn't waste supplies, and thought about what you were doing, you could afford to take risks and explore unnecessary areas.
Someone told me once that the idea that "you can go in there, but you shouldn't because it's probably a waste of supplies" was basically the whole point, and that if you go out exploring on your own away from the main plot, you're an idiot who's playing the game wrong. Is that really the case? If so, I don't think it's the game for me, because I feel like that's almost anti-gameplay.
By the way, I'm not trying to bash the game. I really want to like it, I just... don't :p If I know more about what to expect, though, I'm more likely to give it another try.

I just read, they are not compatible. I am at the part where I'm supposed to get a key from some guy name Brokov or something. I'm also trying to find out what happened to Ghost.

Love SS2. You certainly have access to a lot more ammo later, but the weight problem is always an issue. I would occassionally run low whilst outriding far from the Bar. I always kinda enjoyed it actually, as it required me to switch to a different weapon.
That's not the point. The greatest source of supplies in terms of ammo are other NPCs, so a night assault on the bandit camp in Dark Valley (ninja-style, such an awesome moment) was a highlight during the early parts of the game for me. Admittedly, unless you *know* there are loads of NPCs some place, it's not really worth investigating it until you've got one or two stashes marked on your map.
I would say, to be fair, that the game's artifact mechanic doesn't work for me. Artifacts are powerful and important, but I never sought them out. The anomalies are usually too dangerous.
It's all cool! Just give it another bash (with Complete 2009 if you haven't already) and make sure you at least get to the Bar.
It's probably worth restarting as the game is much better with the mod.
Oh, and if any of y'all find a double barrelled shotgun (hunting shotgun) in this game, hold onto it. I only ever found one, plus one as a quest item, and they are obscene. Much better than combat shotguns. I don't think they're in the vanilla version though.

I find a ton of double barreled shotguns.....hmm thats strange.

I take it you're not referring to the standard sawed off that's abundant even in the Cordon? If not then I can't honestly claim to have ever found such a weapon. But if I go back and play though with Complete 2009 then I'll keep an eye out for it.

Will someone also explain to me what a "blowout" is?

In what context?

I'm not sure, I just heard that you don't want to be in the middle of a blowout.

Now I remember. It's a massive phenomena in the zone that causes waves of mutant animals to stampede away from the epicentre. It wasn't something that featured in the release version to any great degree until you approach the end.
It was brought back in Oblivion Lost, apparently. But I didn't get too far with that thanks to how much broken content it carelessly reintroduced.

A blowout is a gigantic psy emission. The sky turns red, the ground seems like its shaking, you hear thunder, you'll see random "ghost" emissions trying to attack you, and if you stay out in one, the effects become more severe and you start losing health. The only way to live through a blowout is to find cover in a sturdy building somewhere.
You only see a blowout twice in vanilla Stalker, the second time in which you have to get to cover before the blowout reaches it's peak. In Oblivion Lost, they are completely random and occur throughout the game.

I can't say I recall that happening at all in the vanilla version. What points do they happen at?