My 2 cents on laptops:
If you are fairly competent with computer hardware and software (to the point of say being able to build your own desktop), then chances are that you aren't going to need to contact IT every other second b/c "Internet Explorer keeps popping up pop-ups and freezing." In this case, get whatever you want b/c you won't need IT's help to repair the problem.
Now, some people claim you can "get a way better deal by getting something else" or that "Apple is soooo awesome!1!1" or my personal favorite "Dell sucks b/c Windows keeps freezing on it (after I pillaged it with malware)." At the time I got my D820 a year ago, AFTER THE DISCOUNT there was no way to get a comparable brand new laptop for anywhere near that amount. The market conditions may be quite different this year... shop around.
Apple is NOT anywhere near all that is advertised and you'll have to run VMWare Fusion on it with (gasp) Windows installed on the virtual machine to get the functionality you need. So I don't recommend that.
Finally, if you've got a computer that you've purchased within the last couple years that works fine, just keep using it. I remember last year that it was recommended we get a dual core proc, 128MB+ Video card, 100GB HDD, and 1GB of RAM... Most people ended up with a core 2 duo, 2GB of RAM, 512MB vid card... and need no where near that... You're supposed to be flipping through a couple web browser tabs/windows, powerpoint, and word, not rendering video!