For video encoding get a quad core Ivy Bridge Core i7 CPU with the "QM" designation which means quad core; the "M" models are just dual core CPUs.
Quick Sync is extremely fast and provides pretty good results if you use software that supports it. Both Intel Sandy Bridge and Ivy Bridge, but Sandy Bridge's video quality sucks so avoid it. Intel probably makes the fastest SSDs, but they are expensive.
The build quality of IdeaPads are okay, I have a Lenovo IdeaPad Y470. It's okay, but not very happy about it. I prefer ThinkPads they are built like tanks, well at least when IBM owned the ThinkPad brand.