Hi, I've been recording through my computer's microphone for too long and I'd like to start recording by plugging my guitar into my Mac.

From what I've researched it seems like I have a few options. I'm confused on what is the best option. Should I go for a simple 1/8" adapter that will plug into the line-in on the mac? Or will my guitar be too soft (need a preamp?)
I'm really looking for the cheapest option with the best sound quality. I found the Behringer FCA202, but I wasn't even sure if it would do what I needed. Is there a known standard that I'm overlooking?

I guess there are a lot of questions there. To sum it all up I'm asking:
Does the Behringer FCA202 work for guitar -> PC and is that better than using just a 1/8" adapter? Or is there something else that would work better?

Thanks