Hey narcist!
Ah man that guide was fun to put together, I loved testing those (and many more). Piano was my very first instrument, I'm formally trained in it so I guess it's my "best" instrument :)
Jim's pretty spot on, it sounds like the Yamaha P-45 would fit the bill. It's just such a great value and is just a solid "cant go wrong" digital piano.
The Kawai ES100 is downright impressive but as you noted it's quite pricey, and also harder to get from local retailers. I'm not too familiar w the Korg SP-170 but I believe the Korg B1 replaced it. I wouldn't get the NP-32 since it only has 76 keys. 88 fully-weighed/hammer action all the way for proper piano playing!
Yeah, Yamaha P-45 all the way - 88 keys, great feel, great grand piano voice, a single stereo 1/4" output jack, pretty decent speakers (hard to find a digital piano with built-in speakers that are stellar), some decent non-piano sounds you can work with, it's light (25 lbs), has a metronome, and adequate polyphony. Ah man actually I don't think it has effects if memory serves me right.
To Jim's point, you can also use it as a MIDI controller since it has USB, and then if you get bored of its built-in piano sound, use a piano VST! Another really fun test we did was to find the best piano VST. The easiest one to get into was absolutely XLN Audio Addictive Keys Studio Grand, it's also pretty cheap and sounds awesome. Demo version on their website :)