Need advice on my first MTB

Hi guys,
I'm looking to get myself my first mountain bike to try out some trails with a few friends, but I'm not really sure what I need.
I've seen these two at Halfords but I'm not sure which is best for the money:
http://www.halfords.com/webapp/wcs/stor ... yId_165499
http://www.halfords.com/webapp/wcs/stor ... yId_165499
I'm 6'1 and I've been told a 22" frame (or 20" if 22" isn't available) would be suitable, is that right?
Any help would be much appreciated.
I'm looking to get myself my first mountain bike to try out some trails with a few friends, but I'm not really sure what I need.
I've seen these two at Halfords but I'm not sure which is best for the money:
http://www.halfords.com/webapp/wcs/stor ... yId_165499
http://www.halfords.com/webapp/wcs/stor ... yId_165499
I'm 6'1 and I've been told a 22" frame (or 20" if 22" isn't available) would be suitable, is that right?
Any help would be much appreciated.

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Posts
As for size - sit on one.
http://www.halfords.com/webapp/wcs/stor ... 65499#tab2
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hydraulic breaks, rock shox and deore for this price is a steel. Its been getting cracking reviews from the magazines and a few forum members rate the bike too.
i am same height i ride a 19 22 is a big bike mate
I'm a bit bigger at 6ft2 and only ride a large (19"), best thing you can do is try before you buy. As above second hand would be a good bet, something like a Rockrider or Baordman would do you well.