Is there a Neutral Path you can tread on? With so many choices and multiple endings, I'm sure there must be a way. Has anyone gotten something close to a Neutral Path/Ending? In the first one you could side with neither Nonhumans nor Order of the Flaming Rose, and really go a Witcher's path. So I'm wondering if you can do the same here.
 
From what I've seen, I was forced to choose between Roche and Iorveth, and ended ignoring Iorveth completely (Didn't even see him since the end of Chapter I). Now, I'm not sure about Saskia since I barely even talked to her, but if there's a way to be Neutral, and be on good side with Roche and Iorveth, that would be great. I didn't want to meddle in politics, but it seemed like I had no choice.

No there is no neutral path, but it can also be said that all paths are relatively neutral. (at the end game dudes will try to make you meddle in politics directly, but you can ignore them and be selfish)

Geralt doesn't really side with any factions in Witcher 2 he only tags along for a while. You are not an enemy of either Roche or Iorveth if you do not chose them, Iorveth is kinda pissed but not hostile, Roche isn't mad either. Roche and Iorveth have a lot of beef with each other however, dudes have been at each other for so long it's more personal for them now.

The endings themselves can be quite varied.

@valrog: I won't pretend to know everything that's possible in the Witcher 2, but the Witcher was all about forcing you into taking sides in a bad situation.  You definitely aren't supposed to be good with everyone. 

@valrog: I don't want to give away too much.

No you don't have to kill either. And meet both in chapter 2. Saskia's story is more fleshed out if you side with Iorveth.

my playthrough,

Well, as long as neither Roche or Iorveth become your enemy, I guess I'm calm knowing that now.
 
Also, I read somewhere that the conversation with Letho is actually the ending you will get. I didn't know his conversation changes so drastically.