First off, w/o knowing which currency you're thinking about it's impossible to answer your question.
Secondly, asking for the best HT MTB is like asking for the best soda - personal preference will determine the answer. There are plenty of good bikes, and there's really no neutral, unbiased answer to which is best.
On downhill trails hardtail mountain bikes are harder to control, vice full suspension. So improve your skills by getting a hardtail.
If you want a do-all hardtail then you'll have to spend at least $700 for an all mountain hardtail. for under $300 though you can get a pretty good BMX or dirt jump bike. but like a said, for a mountain bike, you'll have to save up a bit more.
That really depends on what you want the bike for. For downhill / all-mountain, a full suspension bike is preferable. For cross country a hardtail can still be competitive, particularly for shorter trails. Oil/air shocks have great adjustability, but short mainteance spans. Oil/spring are more rugged, but tuning them require replacing the spring. Elastomer shocks have pretty much died out.
There are so many personal preferences involved that it's impossible to give a solid answer to that. Might as well ask what's the best candy.
Norway.
Norway.
Cross country and swimming. Swimming builds upper body. Cross country builds leg muscle
Cross-country: Norway Downhill: Austria
Cross country would be one of the best ways to train fitness for hockey
The best cross country team ever were the Richmond Burton Rockets from Richmond Burton High School in Richmond IL = )
India, Canada
There's no fixed answer to that. The best bike would be the one best suited to your riding, your size and your wallet. If you want one that doesn't suck horribly if you have to ride it a few miles on roads, get a XC (cross-country) one.