Some advice for an upgrade

Hello from Cyprus. I am relative new on the sport like 6-7 months but i really love it. I own for the last 4 months the http://www.ghost-bikes.com/bikes-2015/bike-detail/panamao-x-4/
Really good bike for its price 480 euros. I am doing like 60-90 miles per week. I am driving around 75-80% on the road, and 20-25% off road and the bike responds very well, i am not trying to be a champ, i just like to challenge my limits. I like off road more than road, and i have some issues with back discs.
I was thinking to upgrade the front fork, and i found those 2 options that i can afford. For the time being i cant afford to buy 2 bikes, one road and one MTB
http://www.bike-discount.de/en/buy/suntour-nrx-e-rl-tapered-28-fork-75mm-matt-white-black-497576/wg_id-8729
http://www.bike-discount.de/en/buy/rock-shox-paragon-gold-tk-28-solo-air-65-tapered-disc-matt-black-461905/wg_id-8729
Do you think that it worth to change it? and if yes which one? If not what do you suggest as an upgrade given my needs?
Really good bike for its price 480 euros. I am doing like 60-90 miles per week. I am driving around 75-80% on the road, and 20-25% off road and the bike responds very well, i am not trying to be a champ, i just like to challenge my limits. I like off road more than road, and i have some issues with back discs.
I was thinking to upgrade the front fork, and i found those 2 options that i can afford. For the time being i cant afford to buy 2 bikes, one road and one MTB
http://www.bike-discount.de/en/buy/suntour-nrx-e-rl-tapered-28-fork-75mm-matt-white-black-497576/wg_id-8729
http://www.bike-discount.de/en/buy/rock-shox-paragon-gold-tk-28-solo-air-65-tapered-disc-matt-black-461905/wg_id-8729
Do you think that it worth to change it? and if yes which one? If not what do you suggest as an upgrade given my needs?
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http://www.bike-discount.de/en/buy/sunt ... lack-33965
Plain steerer, air and proper damper!
Isnt the Santour that i showed an air suspension too? and my RST has a Mechanical Lock-Out, and thats why i am thinking to change it.
And my question, does really worth my investment?
Excuse my ignorance but i dont know the deference, can you please explain to me?
Can a tapered fit on my bike? is 2015 model. Thanks so much for your help.