you would need an extra cooler and fan on dedicated GPU. just might be a bit heavier. not sure if it is a lot.
i was/am strapped for cash so went with AMD. works well. is not strong. well it's more of a netbook with 11,6" screen. but ram can be uprgaded to 8 GB. with normal hard disk it weighs 1.6 kg. strong battery lasts 7-8 hours with wi-fi and bluetooth on. with wifi on lasts about 5 hours of work.