MTB help required, opinions pls.

Guys looking to purchase my first MTB, I live in Belfast NI so have a few shops I can go to.
Been looking at 3 at the moment,
Carrera Vulcan £340
http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_810709_langId_-1_categoryId_165499
Carrera Kraken £380
http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_810671_langId_-1_categoryId_165499
Specialized Hardrock Disc £280
http://www.mcconveycycles.com/store/product/15259/SPECIALIZED-HARDROCK-DISC-RED-2012-21-INCH/
Specialized one was recommended as a good first starter for me, but the review (forks) on here isnt good.
New Mountain Bike Trail in Belfast (Barnett Demense) just opened so wanna get the right kind of bike.
Thanks for any advice
Been looking at 3 at the moment,
Carrera Vulcan £340
http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_810709_langId_-1_categoryId_165499
Carrera Kraken £380
http://www.halfords.com/webapp/wcs/stores/servlet/product_storeId_10001_catalogId_10151_productId_810671_langId_-1_categoryId_165499
Specialized Hardrock Disc £280
http://www.mcconveycycles.com/store/product/15259/SPECIALIZED-HARDROCK-DISC-RED-2012-21-INCH/
Specialized one was recommended as a good first starter for me, but the review (forks) on here isnt good.
New Mountain Bike Trail in Belfast (Barnett Demense) just opened so wanna get the right kind of bike.
Thanks for any advice
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I have been going by the reviews on this site, both Carrera's get top marks, Specialized gets okay review, though forks let it down.
Cool you reckon Specialized is nasty, would it not do as a first time bike and maybe uprgade the forks when get used to it, or are there other parts/gear thats def better on the others.
I dont know cycle parts as you can tell.
Cheers folks all advice greatly appreciated.
Halfords have a deal on til Tuesday spend 400 pound get 40 pounds off so could purchase the carrera kracken for 389. Rather than 430 online and 450 in store which I think I'll be doing.
Oh and the deal is an online deal
Hope this helps abit
Thanks JonesNick, yea noticed that myself Kraken would come in at £390 with discount applied, seems to be alot of bike for that money.
The carrera kracken has rave reviews and review of being the best bike for under500 pound.
Good luck purchasing a bike and I hope all goes well