If size and weight are an important factor for your selection, Dell's XPS 15 line might also have some options for you (don't go for anything lower in the ladder, for the sake of quality. The XPS line draws from the Alienware series).
Expect to pay over $2K though, and closer to $2.5K for one...
The only safe way to do that would be to use a mixer, which requires power, which in turn is probably not ideal for your needs (mobility).
A simply Y-splitter (2 male to 1 female) might work, but it might also zap your outputs.
I would also agree with this.
The other upgrade ideas would have marginal effect on overall performance.
Opting for a larger data drive (non-SSD) would help with storage but that's pretty much it in terms of impact.
Got my GTA Online character to level 8. Going slower than expected as I'm experiencing some server stability issues. Next on the agenda: reach level 12 and use some of the pre-order bonus money to get a decent apartment.
The campaign mode is going well, and now that I've remapped my aircraft...
You'll probably find that "small and light" will be difficult to match with "fast and powerful" when dealing with high end laptops.
Here's what I would get: Notebooks & Ultrabooks | ASUS ROG G751JY | ASUS USA
Built for gaming, sure, but would be more than adequate to handle your current needs.
I wish I could debate that, but the reality is that's likely a lowball estimate there...
As a completionist, I must have spent hundreds of hours in Fallout 3, Skyrim, Far Cry 3/4.
Besides the multi-monitor setup suggestion, dedicating the GTX 660 to handle PhysX might be another option if your PSU can handle it. It's also good if you're running higher resolutions / 4K.
I don't have exact numbers, but I'm not convinced the performance would be noticeably better than the...
Since BFG closed, EVGA has been my "go to" supplier of graphics cards. I currently have the GTX680 FTW edition.
Wife has a Gigabyte (GTX660) and I can't complain about the reliability there too.