South America vs Southeast Asia

Another vote for South America. I am a bit concerned about your budget and stated interests though. Doing some things like zip-lining etc. can eat into it fairly quickly. Here is a decent site for some basic info.
http://travelindependent.info/america-south.htm

@motameus
I know, I've read about that, which is why I had such a hard time making my choice. I think what really decided it was the fact that I don't want to check out southeast Asia during monsoon season, I'd rather go when it's at it's best.

@Travelinstyle
Yeah I didn't really consider that, but I'm not planning on doing those exclusively, just when it's really worth it. I guess I'll just play it by ear as I go along, and cut back expenses on other days to make up for it. perhaps I'll only do a few of the things I mentioned. And yeah, I love travelindependent, I've spent many hours reading through it. I'm glad so many people are pushing for SA.

and also, thanks a lot to everyone who answered, all your opinions have been very helpful!

You were also wondering how you would feel after a few weeks travelling by yourself.. well, in my case, when I travel by myself I feel tired after 3 weeks or so. Not homesick or anything, but I think I need time to assimilate what I saw or did, or maybe I just miss sharing my experiences with someone else. I do not have this problem when I travel with someone else. But hey, this is just me... lots of people here in TT spend months/years by themselves on the road and theyÇre pretty happy about it. So yeah, hit the road with an open mind, maybe you love it, maybe you want to get back after a month or so.

It's strangely comforting to know that someone else would be weary of it after a while. Everyone who I've really talked to about it tells me there won't be any of that kind of feeling but I remain convinced that I will get homesick, or tired. Hopefully I will be able to go 2 months without any adverse effects, but I guess I'll find out right?
Thanks for your reply, all input is welcome!