Since I canceled my order the other day to make a change, I've been thinking about whether or not a 15" will really suit me well. For the record, I had ordered a 15" 2.2 GHz with the hi-res antiglare display. I went into the Apple store yesterday and played around with the 17". I was pretty amazed at how much of a difference the larger screen makes. It's absolutely beautiful. I am now wondering about a couple things that will help me make my decision. My two options are: 15" 2.2 GHz, 4 GB RAM, 128 GB SSD, Hi-Res Antiglare OR 17" 2.2 GHz, 4 GB RAM, 128 GB SSD, Antiglare (I'm buying the Apple SSD because upgrading at $90 isn't a bad deal, and I like the Apple support it comes with; I have lots and lots of external storage, so it really isn't an issue. I might even pop my old 1 TB WD Scorpio Blue back in if one day I decide I want that much internal storage again, and shift the SSD into my old Optibay.) Is the 17" noticeable less mobile? I already have an 11" MacBook Air to carry around on a day-to-day basis, so by "mobile" I really only want to be able to carry it in my backpack from point A to point B (both places with tables/desks), without feeling a significantly larger amount of weight in there. Also, is fitting the 17" in most backpacks an issue? To answer a major question in advance, I plan on using the machine as my main computer, in my room. It will routinely be used to run Handbrake encodes, and other forms of HD video processing. I watch A LOT of movies, but don't actually do any video editing (though I might pick that up this summer). Another thing I'm wondering about is if the 17" runs cooler or warmer than the 15". I realize both have the same processors and GPUs, but I was wondering if the larger form factor allows for better heat dissipation in general. So, is the much much nicer screen real estate worth the sacrifice in portability and the ~$300 price hike? Thanks for any opinions you guys have!