You mention running simulations, compiling, etc. You have some Dell and generic "mac" suggestions.
Sager is a company a lot of people have never heard of, and they market more to gamers, but the systems are very solid, have great performance, and cost less than comparable mainstream systems. I have run different Linux distros on 2 of them (4+ years old, and new).
I'm going to say around $1500 will get you 16GB RAM, 1920x1080 display, i7 CPU, 120GB SSD, 1 TB hd, backlit keyboard, DVD burner, etc
Because they are performance based you may need to tweak settings if you want more battery life, but you didn't mention an interest in that. I've never cared, I wanted a portable workhorse and that's what I got.
Check sagernotebook.com or powernotebooks.com