3 bikes to choose from HELP!!

Hi, just joined the forum, looks like a great place! I am after a new bike and have narrowed it down to 3 bikes. The problem is, I cannot decide which one to go for. We have the FELT Q800S 2007, the FELT Q720 2007, and the SPECIALIZED HARDROCK PRO HYDRAULIC DISC 2007. The Q800S is the better specced bike, but has no disc brakes. The HARDROCK PRO has a funny looking frame, which I am not too sure about. However, the 2 FELT bikes only have 80mm travel on the front forks, whereas the SPECIALIZED has 100mm travel. Will I notice a difference? I cannot ride any of the bikes before buying, can anyone help me? I have put links to the bikes and specs below if this helps!
http://www.evanscycles.com/product.jsp?style=70348
http://www.evanscycles.com/product.jsp?style=70347
http://www.evanscycles.com/product.jsp?style=70056
http://www.evanscycles.com/product.jsp?style=70348
http://www.evanscycles.com/product.jsp?style=70347
http://www.evanscycles.com/product.jsp?style=70056
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I'll see you at the end.
You'll see me on the floor.
VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
I have the 8.2 and it is really a lovely thing... the 8.1 is the one down... still MUCH higher spec than the ones you are looking at AND the Decathlon warranty is awesome... 2 years everything and 5 years frame!
http://www.btwincycle.com/EN/Product_ar ... index.html
VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/