I need help deciding. I have a 15-inch MacBook Pro Retina and I want to purchase a smaller, more portable MacBook for work. I'll be downloading and using word processing apps/Microsoft Office (word, ppt, excel), sending lots of emails, surfing the web, YouTube, etc. Is the MacBook, with these specific specs (see screenshot) capable of performing these tasks and without getting warm? And for how long can it do so on a single charge? Or is the MBP Retina a better option?