ok so i am an adrenaline junkie, and sense i broke my back and arm in december from an all mountain skiing accident im looking for a new sport. im not entirely new to biking, when i was younger i raced BMX bikes so i do have some experience on a bike, i am though for the most part new to mountain biking. and i did read the mountain biking FAQ and it helped alot, but i had a few more quesitons i was hoping i could get answered. im looking for an all mountain bike BTW.
i know that it says that "newbies should never buy a bike online" but you can get SUCH good deals online that its tempting. for example, i have around $500 to spend on a bike, online i can get a used $1000 bike for $500 which overall is used but better correct?? or a new not as good $500 bike. what is the better choice?
and any other info you think would be good is appreciated