Hi Jimmer,
The price difference between a 114 and 314 or 414 seems steep at the onset, but amortize that add'l cost over years of added enjoyment and
that ends the discussion ...IMHO.
This is, of course, based on "more enjoyment" one derives from the guitar. There is naturally a point of diminishing returns in which one spends more money and receives no more of those feel-goods. That is the balance, challenge, (and fun part) of finding the
right guitar for
you.
You asked for advice, here's mine: go play
many other guitars.
Yes the 414, but also 314s, other models, other body styles, and other brands, as well. You will quickly find that certain marques have a "feel" about them, and you will naturally gravitate towards one and away from others. Taylor, without question, has that "feel" that we love, from the body shape to the neck carve and action, and certainly the taylor "family tone," so to speak. BTW, once you step away from the 100/200 models into the 300+ models, apart from solid woods, you're getting a wider neck (1 3/4" at the nut vs 1 11/16") which for many, feels less cramped and easier to play. But try others and weigh that cost vs enjoyment thing, then pull the trigger.
FWIW, I think you've already "sold yourself" on the 414 simply by virtue of your post and tone here
But before committing, try that 414 alongside others in that shop, and if you can other guitars elsewhere (some stores like GC as well as some web-shops have a return policy). Oh yeah, I'd also sell/trade the mini to help fund the "upgrade" you're looking for. And of course, used is the best bang-for-buck, no doubt. Just some food for thought ...hope that helps you a bit
Edward