Need to upgrade the fork on my GT Outpost 2010

Hello there fellow riders,
I am in great need of some assistance. I am lookin to replace the stock fork on my 2010 gt out post.(medium size and has disc brakes) I Don't really know where to begin, I'm a noob at this sport. Any suggestions? I have a budget of $150.00 . I payed $250.00 for it so I don't want to put inn more then I payed for the bike. Thanks
I am in great need of some assistance. I am lookin to replace the stock fork on my 2010 gt out post.(medium size and has disc brakes) I Don't really know where to begin, I'm a noob at this sport. Any suggestions? I have a budget of $150.00 . I payed $250.00 for it so I don't want to put inn more then I payed for the bike. Thanks
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$=US, Aus or some other?
The Outpost comes with a very basic Suntour M3000 fork, so nearly anything would be better.
Past tense of pay = paid by the way!
Simon
Thanks for the suggestions. At this point any suggestions from the UK, Asia, South America, would be of some help. Pretty much anything is accessible though the web now a days.
Simon