Without a doubt, doppleganger. He's your first priority at this point, since you want the items he'll give you.
Also, don't forget that you have to beat him twice to get everything you need.
Your guild rank will only go up one more, but I reccomend doing it anyways since you get some interesting extensions.
Lucky animals you don't really need to worry about. You get some stuff from him that you can get ONLY from him, but it won't make too big of a dent on your ryu books.
And don't even bother with the flier one. You only get items. Nothing worth finding all those players. I figure they just put it in there to make you find all the characters so they didn't waste their time making 200 characters just for you to never talk to them.
Definitely finish the PKK quest. You get some primo weapons and armor from that sidequest. It's the only way to get the.....second (I think) best dual swords in the game. That, and you get to see some really funny chaotic PKs when they go "I'm gonna rip you to shreds!" and then you kill them in one combo and they start begging for their lives.
Mechagrunty sidequest, you wanna do. Some of the items you get from that quest may seem stupid, but they're important later on.
Yuor level is fine, but it'll help a good deal to be level 50 when you transfer to the next volume.
BTW: Good job of organizing this time.
