At first, I placed an order for the 15 inch 2.9/16/1TB/460 mbp with touchbar, but as I went into my local store to try it out, I just couldn't get comfortable with the touch bar. It was only useful for navigating multiple tabs in Safari (for me personally). I didn't like how the touch bar needed to be expanded each time you wanted to use it (unless this can be changed). And, I'm a bit hesitant now due to the battery lifes being reported recently. My type of usage would be for heavy student multitasking - multiple tabs open, multiple PDFs open in preview, and multiple word documents. I'm assuming the 13 inch nMBP with upgraded processor, ram, and storage can handle this. This would be coming from a 2013 13inch macbook air with upgraded processor and 8gb ram, and 128gb storage. Though the extra screen real estate was one of the main drivers in ordering the 15 inch, I think getting the nMBP along with a 4k external monitor would give me the best of both worlds - portability and screen size. That being said, I'm quite uninformed when it comes to what setups can drive what monitors. If I'm understanding my research correctly, a 4k monitor can be driven at 60Hz with even the base 13 nMPB due to having thunderbolt 3? If so, what 4k monitors are suggested that won't result in a laggy experience?