I think the Kona is speced the best out of them all and is also a solid brand. What is your price range in US Funds, I can give you some other ones to look at off of that.
Haro Is better at making BMX then they are at making MTB and are on there way to becoming a Wal-mart Brand
The GT frame is Bullet Proof, I am basing this off a guy on my XC team who has one has his DJ, Freerideing bike.But he has changed somethings on it.
Focus looks like a waste of money for what you are getting.
Also try top stay with the Dart line of Forks I think they are by far the best fork in that price range.