Mtb for newbie wanting to do some XC/trails

Hi all, this is my first post so please go easy 
I've been riding road bikes for quite some time now and am very happy with my current trek - however, there are a few guys on my uni course who have mtbs and often ride XC/trails and I'd like to join them so I'm looking for a mountain bike to join my road bike. I've been looking at Giants - mainly because of the cheapness of them here (although I am limited by the fact I'm a medium and most of the deals are for smalls):
http://paulscycles.co.uk/
I'm looking at hardtails purely because you can get a lot of bike for your money compared with full suspension bikes and have been told that I won't need a full sus for the sort of riding I'll be doing. I don't mind getting an older model i.e. 2007/2008 as long as the discount is good.
I'm looking at spending about £700ish, however I have been offered a Giant XTC Alliance 1 - 2008 for £950 (from £1100) by my LBS which was tempting.....however, does the carbon fibre/alu frame make it worth that much more over the XTC 1 or XTC 0 which can be found on the above link? The guy in the bike shop didn't seem to recommend alu framed XC bikes (something to do with them not taking hits very well) which got me a bit worried but I don't know whether that was because he was trying to sell me the above bike....?
Any help greatly appreciated and if something doesn't quite make sense, please feel free to ask, I'm not too clued up on mountain bikes.
Thanks, Arry

I've been riding road bikes for quite some time now and am very happy with my current trek - however, there are a few guys on my uni course who have mtbs and often ride XC/trails and I'd like to join them so I'm looking for a mountain bike to join my road bike. I've been looking at Giants - mainly because of the cheapness of them here (although I am limited by the fact I'm a medium and most of the deals are for smalls):
http://paulscycles.co.uk/
I'm looking at hardtails purely because you can get a lot of bike for your money compared with full suspension bikes and have been told that I won't need a full sus for the sort of riding I'll be doing. I don't mind getting an older model i.e. 2007/2008 as long as the discount is good.
I'm looking at spending about £700ish, however I have been offered a Giant XTC Alliance 1 - 2008 for £950 (from £1100) by my LBS which was tempting.....however, does the carbon fibre/alu frame make it worth that much more over the XTC 1 or XTC 0 which can be found on the above link? The guy in the bike shop didn't seem to recommend alu framed XC bikes (something to do with them not taking hits very well) which got me a bit worried but I don't know whether that was because he was trying to sell me the above bike....?
Any help greatly appreciated and if something doesn't quite make sense, please feel free to ask, I'm not too clued up on mountain bikes.
Thanks, Arry
0
Posts
One benefit of buying locally is trying for size. You say you are a 'medium', but the variation in MTB sizing is much greater than road bikes, with lots of different geometries even for the same listed size.
Sounds like a hardtail is the way to go, and for that budget should be able to get a decent machine. Might want to look at Treks and GTs offerings too.
VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
Giant Trance 3: http://www.pinkbike.com/photo/2673893/
Its done less than 100 miles total, is in excellent condition and has several upgrades.
Upgrades are:
Mavic crossride wheelset - less than 20 miles done
Rockshox Reba SL (2008) withb poploc- less than 20 miles done
Race Face Dues XC riser bars
Kore race stem
XT front mech
XT cassette
Race Face Evolve XC seatpost
Hope seatpost clamp
all other components are original spec.
Bike is in absoluteley excellent condition.
Looking for around £675 cash on collection. From North Notts area.
Original receipts and manuals are included.
Is that a better spec than the 2008 XTC 1?
If selling bikes on the forum, please use the classifieds or PM the person who may be interested.
VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
http://www.ukbikesdepot.com/products.ph ... 2286&rs=gb
Moda Chord with drop bars and Rival shifters - winter/do it all bike
Orbea Rise