Thanks to the both of you for your responses. I know you all often times get the same questions so I really try to read the threads before I post.

I'll take a look at all options as I'm not unwilling to pay. Gaucho, I saw one person you suggested above, but do you have others?
Also, one last question...I promise. :-)
Do you all have any suggestions for local tour operators who plan trips throughout the country/region? I'm going to talk a group today who has been giving me ideas. I am a women in her late 20s traveling alone for about 17 days. The plan is BA to Patagonia (Chile & Argentina) and then maybe back to BA. I know I'm getting off of the thread topic. This time, I've done a thorough search and gotten some valuable info (intra AR passes, itin planning, etc) but my needs & interests are a bit different. You can PM me to avoid going off topic & I can give more background. Thanks again.