Want a Mountain Bike but have no clue where to start

So I want to pick up a mountain bike but really have no clue where to start. I would like to keep it under a grand but can be convinced to go a bit higher if it warrants it.

I figured I could score a good used bike with upgrades on craigslist but I don't have the knowledge to know what is good stuff and what is not.

Any suggestions for new? Any STEALS currently on craigslist?

thanks
Rick

 

maybe start at a bike shop?

 

full suspension and will fit in the leaf

 

^^a-hole

 

https://atlanta.craigslist.org/nat/bik/5633722680.html

it's local east cobb and within your budget @$750, sorry I thought I included a link

 

Or Robert - oclvframe.

 

Really any good links to information that will allow me to get up to speed on good components and what to steer clear from.

This is a perfect example, I know the bike was 4K new and would seriously consider spending 1500 on this but have no clue what I am reading. did he upgrade anything or are they all stock components. I have not looked seriously at bike components since the 80's! LOL

http://atlanta.craigslist.org/atl/bik/5543131649.html

 

Do you know what size bike is right for you?

 

I'm 5-11, everyhing I read says large 19-21. No clue other than that

 

Check out REI. I have got both my road bike and mountain bike (both cannondale) from there on clearance.