Sorry to do this.... which bike should I choose?

Right guys, after loads of researching on here and other sites, I have some choices to make to would appreciate your help....
Options:
Carrera Vulcan 08 Disc from Halfords = £280 (with free £50 accessory voucher)
GT Agressor XC.03 08 from Halfords = £299 (with free voucher as above)
GT Agressor XC.03 07 from Halfords = £249 (with free voucher as above)
OR
Bike 2 Work scheme:
GT Avalanche 2.0 would cost me £275.97 over the year (plus any final purchase fee) + about £23 for a helmet (have seen a cool one reduced in Halfords)
Whilst the Bike 2 Work scheme is good for getting me a better bike for similar money, it seems a lot of hassle and messing about compared to walking into a shop and paying in full....
So whilst I imagine the Avalanche 2.0 is a lot better than the other 3, is it better enough to warrant the extra messing about?
Cheers
BTW should just clarify, I imagine most (all) of my riding will be XC on trails like FTD on Cannock Chase....
Options:
Carrera Vulcan 08 Disc from Halfords = £280 (with free £50 accessory voucher)
GT Agressor XC.03 08 from Halfords = £299 (with free voucher as above)
GT Agressor XC.03 07 from Halfords = £249 (with free voucher as above)
OR
Bike 2 Work scheme:
GT Avalanche 2.0 would cost me £275.97 over the year (plus any final purchase fee) + about £23 for a helmet (have seen a cool one reduced in Halfords)
Whilst the Bike 2 Work scheme is good for getting me a better bike for similar money, it seems a lot of hassle and messing about compared to walking into a shop and paying in full....
So whilst I imagine the Avalanche 2.0 is a lot better than the other 3, is it better enough to warrant the extra messing about?
Cheers
BTW should just clarify, I imagine most (all) of my riding will be XC on trails like FTD on Cannock Chase....
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All the bikes you mention are decent bits of kit. The GTs would edge it for me though.
Cheers