QUOTE(stealthfire @ Sep 8 2011, 15:37)

Well, I have 2 extra aura points, though I question the effect of getting an additional aura.
How's the bonuses calculated anyway, are they a multiplier to the current percentage, or a flat addition to the current percentage?
Like, if my chance is currently 10%, then +10% means 11% (10%*110%) or 20% (10%+10%)?
I'm trying to figure out which one is the most efficient really. is there anywhere that explains these chances? A search doesn't seems to turn up anything useful.
I presume with montage gone, and the importance of proficiency, assimilation would probably be quite useful, but it's cost can probably pay for 2-3 points in other skills.
IMO, get the aura slot.
Apart from the bonuses to stats and mitigation/damage/evade/whatever and resists that the aura gives, it also gives 7% to exp. This is a one-time bonus and does not increase when you rank up the aura.
So putting a aura point into an extra aura, instead of ranking up an existing aura means you get that experience bonus.
And aura experience bonus is added after other bonuses, such as those from posting (up to 100% of the base) and exp tanks and adept learner.
So taking myself as an example, I get 100% from post bonus (I post-whore in the spamhaus-section every morning), then I get 74% from adept learner (next rank costs 2,606 credits, kinda cheap) and 99% from exp tanks (abilities, they work now after the patch).
Those stacks additively, not multiplicatively. Which means I get +273% from those, for a total of 373% of the base (100% being the base of course).
But then the auras are adeed on top of that, and they are stacked additively with other auras, but multiplicatively with the other bonuses (and the organised mind hath perk is added multiplicatively to everything).
So for me, I got 5 auras, which is a 35% bonus.
Which means I got a total bonus of 503%.
So that 7% bonus from the aura is actually worth 19% from the base, for me.
And the more points you got into experience tanks and adept learner, the more you get out of them.
Also, costs for training doesn't follow set guidelines.
The first point into refined aura costs 25K, the second 50K and the third 75K (only got 2/4).
But the assimilator, which has 10 steps, costs 50K for the first one and 107K (almost) for the second.
And the quartermaster and archeologist works from the base chance. So with maxed quartermaster and archaelogist, you double your chance of a drop. And since scavenger says +2 and has 50 steps, I assume that means the same thing. Maxed it will double your chance for a drop.
Luck of the draw apparently works by giving you a bonus to the roll for items, so giving a better chance for the higher stuff, just like lvl, difficulty and such.
IMO, get refined aura, it really pays off. Having more auras is better for the experience bonus, than having ranked up auras.
Also, adept learner is really good, since it gives a nice bonus, is quick to train and the cost of it rises very slowly.
Ability boost is also real nice, also cheap and the cost rises pretty slowly, and you can always do with more ability points (1 ability point into exp tanks give 3% exp bonus, while 1 point into adept learner gives 1%).
Assimilator might be nice, but gets really fricking expensive, I wouldn't recommend getting it until later on.
Lvling up fast is best IMO, since that will get you more cash as well, meaning you can train the other stuff then.
I'm at lvl 100, and right now it is the training time that sets the limit for me more than the costs (except for assimilator) since refined aura and archaeologist takes 24h and others 12h and 8h.
Just adept learner that is quick (and karma amplifier, but I fail to see the need for that).