thats about half price (ebony gloss) ,, if I'm not mistaken,, I think the price is fair...
yeah kawai's are good pianos.. my second choice for an asian made piano (yamaha 1st) --
don't worry about it holding tune,,, there are many factors that can change this,, things like climate, humidity, playing styles, etc, etc.... so as long as you take care and service your piano,, it should hold tune,,, its only 10 years old,, the pin-block shouldn't be in bad shape.
as far as sound,, it should be fine,, you can always alter the sound of your piano with a good tech,,, they can voice your piano.
the sound being loud? well,, its only 5 foot,,, and sound all depends on the room you have it in,,, high ceiling, position of piano,, wooden floors, carpet floors, walls, everything will change the sound/volume of your piano.
Does it sound metallic or tiny? well,, thats pretty much like the previous question... and no,, I've never played on a kawai that sounds metallic,, and even if I did,, I'd get a good tech to prep it for me.
the final decision is yours... sit down,, play it,, and if you like it, then buy it.