Well, I am a prime user and I can tell you from exprience that 24mm and 135mm is a huge difference in focal length. You will miss a lot not having some sort of general perpose focal length/lengths, especially if you are going to hike the AT. If you are going to hike the AT reletivelly soon I wouldn't even think twice with the 24-105mm, in a landscape situation you are almost always stopped down to f/8-11 with low ISO's.
You said your primary intrests were landscape and portraits, if thats true then I don't see why you want a 24mm f/1.4 for. Yes it can be used for landscape, but so can just about any focal length as well, the only advatage is a small IQ (stopped down to typical landscape apertures) is that worth missing a very lage number of shots? Well most of my shots are in that range, but don't you like the rest that aren't in the 24mm range? The 24mm f/1.4 is more of a streat/wedding/creative photography lens and can be used anytime you need that focal length but to limit yourself to just 24mm and jump to the other end of the spectrum to 135mm is not wise. I thing you are reading to many reviews that praise this lens when its used properly. Just like if you read the glowing reviews of the 1D IV, it's a fantastic camera but a 5D II is a more suituble body for landscapes or portriats. Unless your portriat subjects are birds then that's another story:-) Then there is no comparison.
Another point to consider is just because you shoot a particular focal length more often than another one doesn't necessarily mean that's your favorite one, I don't shoot my 600mm the most but I like it the most. But to say that you need to shoot a wide variety of subjects for a while before you can confidently say that. Such as HD or me. I am not 100% sure on your experience but that fact that you are not certain about what lenses you want tells me you are probably not in that position.
Of the lenses you listed I would get the 24-105mm and 135mm and later on get a 16-35mm and some other prime, mabye a 50mm or 85 mm prime. That is a far more reasonable compromise. Or any other combination that is not prime only.
In my honest opinion my first recomendation would suit your shooting style best with primes added later on, I know you are anxious to try primes but there much less expensive primes out there that can fill that niche and not sacrifice a whole lot in doing so.
All the best,
John.
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