where should i land ?
Wherever you can get a bike.
You have a bit of a problem. If you want to go between countries it is very unlikely that any company will rent you a machine.
There is a place in Bs As Argentina that I came across hiring Transalps for 70USD a day. A bit much eh? I doubt if they would let you out of the country though (and this is necessary if you want to go to the southern tip). You could have a lovely time just touring Argentina however.
which bike do you recommend there?
Depends where you go. The southern countries have fast roads and long distances in the plains. The Andes are slower going. Bolivia is much slower. No right answer I am afraid. Up to you.
To be blunt, your problem is finding anything at all.
In a month time, can i drive to patagonia then andes mountains ?
Yes, no problem. It'll be lovely.
A suggestion: there is a KLR250 for sale in Bs As in January owned by an English couple. It has done a few miles (a good number of them with me) so you might be able to get a reasonable price.
A few pics here(it is the green one Rachel is on):
http://www.b13media.com/lois/journal_20030830.html
http://www.b13media.com/lois/journal_20030811.html
and more recently...
http://www.horizonsunlimited.com/tst...062.php#001062
I doubt whether they are going to bother shipping it home. Maybe you could make them an offer? (I have no interest in this deal btw) It is all set up for travel. I can't say what state it is in though. Worth a thought. see
http://www.horizonsunlimited.com/ubb...ML/000512.html
We are in Nantes. Not far.
http://www.horizonsunlimited.com/tstories/kennedy/
Simon