I am currently weighing in two laptops, both by Lenovo.
$712: i5-4200U + Nvidia 840M
(-) Lower clock speed & turbo boost
(-) Intel HD 4400
(+) Power efficient
(+) Quoted as being 35% faster over 740M
(+) 2 GB graphics memory
(=) 4 GB system RAM
$720: i5-4200M + Nvidia 740M
(+) Higher clock...