I myself picked raven 3 for my alts, and am currently on raven 6 on my main. Instead of picking a weapon with 8 slots, mine got them all unlocked as I kept upgrading it. Risky I know, but it was nice to get it there. As the initial poster said, it's kind of fun to do it this way, even though it may not be the cheapest. I'm going VERY slow here in comparison with what most may call average progression speed (doesn't help that I'm trying to gear up all my alts slowly at the same time, derp). I'm not aiming at any top spot. All I want is to be able to do low tier dailies and strengthen my character enough to be confident into joining some raids and have a significant contribution there since I totally hate to be carried, despite how disastrously bad I play. My current modest weapon aim for my main is aransu 3 at the moment.
As for prices for raven energy/ferocity/animus, I haveve consistently seen the choice box selling for cheaper (17G usually) than the actual items (25G, and depending on which of the 3 you need, some can go up to 40G). So yeah, some observation is required to get the best deal there.
My main character is still rather low on dps. Somewhere between 100 to 200 K, near 300K with buffs like food or soulburn. But that's because I'm using the accessories from refuge, which by now are not the strongest ones, and they are far from maxed. The merchant has some stronger accessories but they cost 600 buds if I remember correctly, not an amount you'd farm in "just a few days". Still, and again, it's kind of fun to at least follow what others did in the past instead of skipping stuff. I'm also still using lowbie gems. An octa and a bunch of story hexas. Will look into that eventually too.
Anyway, I'm still bad at the game. My reaction times are way too slow to be competent on harder content, and harder more active dungeons literally give me headaches anyway. So all I want from this game is what pretty much everyone else already has for granted. Not to be a top dog, but to at least feel relevant wherever I play with others.