Never liked Toshibas which gives a "comforting" feel that you also pay Toshiba tax.
And no mobile CPU is match for desktop one, I'd rather go with a desktop and a cheap Win 8 tablet for presentation purposes ( Asus T200 perhaps )
Amen to that. While I wouldn't say the TO NEEDS a particularly powerful CPU with his modest use case, mobile CPUs are at least 50% slower than mainstream desktop CPUs, at least in multithreaded workloads. Intel Mobile CPUs are still dualcores at max, which makes them comparable to the i3 desktop CPUs... with frequency differences and different Cache sizes, a mobile i7 might be a little bit faster than the fastest desktop i3 (IDK, I didn't really compare them that much).... but it will be at least 50% slower than a desktop (mainstream) i7.
On the flip side, the desktop i7 uses 2-6x as much power while running at full speed. That is a biggy when working on the road, but of course is not of much help if you are working thetered to a power cable. You might still save some electricity, but thats about it.
And price wise, the mobile i7 will be in the same territory as the desktop i7.... the desktop i3 which is comparable speedwise, but still uses more power, is much cheaper (which might make a difference in the total price if you buy a pre-assembled machine).
To cut it short -> TL; DR:
I second Unduli in going for specialized machines over one-does-it-all. Usually, you get more power for a better price.
A laptop is a good (or the only) choice if you need to work on the road. If you want to be able to work anywhere in your house, also.
If you have your office and will work with the machine thetered to the wall 100% (or more than 95%) of the time, i'd first go with a good desktop.... then look into what I need for the other 0-5% afterwards. Do you really need the same amount of power on the road? Or will a cheap laptop / tablet do for simple word processing or only some e-mail checking?