Again, speaking for the sport pullover (which is a short binder), I've found that the bottom tends to sit a little above the bottom of my ribcage, if that makes sense.
I will admit, the arm holes could be tighter, though from what I can tell of your linked-to picture, they are tighter than your T-Kingdom binder. My best description would be that, for me, the bottom of the arm hole is pretty perfectly matched to that of an A-shirt, so I guess not real high, but not real low either. It is sort of wide though.
Are you considering pull-over style binders? Full-length? Love Boat does seem to offer a number of different styles, which is the good thing. Also, as Henry said, their customer service is good when it comes to answering questions and helping out if you're not able to get the answers you're looking for in your thread.
As for Darrin's point: I'm not exactly small-chested, not really (by measurement it seems it, but I actually have a fair deal of tissue to deal with, albeit not very dense tissue), and I've found Love Boat binders to work really well for me. It can also depend from binder model to binder model and positioning and all of that. Of course, that is not to say that it will work the same for others as there's so many factors when it comes to binding and which binders work for each individual and which ones don't. Of course, I know that a lot of us already know all of this (though it doesn't hurt to remind).