We have two towers right now and I plan on them being the last. My son has my old gaming pc which is four years old and I have my new (upgraded) pc that is in my sig. I don't plan on building any more tower pc's. My next computer will most likely be a MacBook with Retina display although that will be a few years away yet. My wife is laptop only with a Win7 laptop and a MBA.
This doesn't work as well as I expected it to, because the laptop I use gets pretty warm under heavy load, and it's not comfortable to use its keyboard for 8 hours a day. So I end up using external keyboard just cuz of that.It helps to have a machine with a decent built in keyboard so you don't have to use an external one.
You can see the rig in my signature.
The 680M overclocked basically matches a very mildly OCed GTX670 desktop so I should be good
3940xm, nice. I have been thinking of upgrading my Vertex 4 to a Vector or Samsung 840 Pro. The 3920 and Vertex 4 were the best out at the time when I bought my system. I find the 680m to be a bit slower than desktop 60's, although I am running the stock VBIOS so I am not overclocking it a ton, just as much as the stock VBIOS allows (like 850Mhz or so, cant remember exactly).
if I spend more than 2 hours in front of a laptop my eyes get tired and my back hurts
I'm rocking a Dell Latitude D830. Core 2 Duo (2.2 Ghz) + 2 Gigs of RAM + Windows XP + Samsung 830pro + $200 (the price we paid for it AND the SSD we threw in) = one mean workstation.
Other than that, I run two desktops - a Winder's box and a Linux box.