Whilst Mixture is possibly right in telling folk to avoid the UK's PC World, Mike's overall message of getting there to try out the mouse/trackpad/whatever arrangements is spot on.
Last time I had a Company bought laptop, I just asked for the lightest possible weight, due to my travel schedule.
Er, Dumb!!
The tracking device was usable, just. I hated it.
As he says, if you do not like the mouse/trackpad/whatever, you are stuck with it.
Try it out first!!!!
If you do not, IMHO all the i7/i5 etc stuff is for the birds. You will hate the whole deal.