Yeah I get that a bit... but do you want to WORK with a laptop keyboard and screen? Probably not.... That means at work you have a monitor + keyboard + mouse ... and the same at home... or bring those with you. $1200 desktop gets you a quieter, longer lasting system than any laptop (SLI in laptop is going to be murder on fan noise and heat). So get 2 desktops, one for work one for home and buy a $600 laptop that is more portable. Maybe its personal opinion on how terrible a laptop is to actually have to do long term work on one. I can't stand it.
Alienware, The newest G series from Asus, XoticPC will let you customize all sorts of different laptops, Lenovo y5xx can get up to SLI graphics
If $3000 is your budget I would leave room for some nice monitors (laptop screen + 1 22"+, maybe even laptop + 2x screens?) and Possibly leave room for a docking station for the laptop