Advise needed for a novice. I’ve been eyeing a 27” iMac for a while, just because. I would use it primarily for documents, web surfing, Youtube. and very little use with Gimp to crop, brighten personal photos. That’s it. My computer needs are 90% for home and 10% for travel. What if I purchased a 13 inch Macbook pro instead and attached a 27” monitor to it ($200-300), a wireless keyboard and mouse? Or just get the base 27” retina and stick with my iPad for travels? Thank you.