$350 - NI Komplete Kontrol S88 MKII 88 key keyboard $350 - Refurbished Direct from NI - but it looked brand new when I bought it. This uses Fatar TP/110 keybed (Same as MK3 too)
$700 -Studio Logic SL 88 GT MK2 88 key keyboard ($1000 new!) These have have the state of the art best available Fatar TP/400 Wood keybed and this is pretty much new open box.
I'll keep the one that doesn't sell - they both are great. They both have Fatar keybeds which is the closest to a real piano you can get, though the Studio Logic has the absolute best. The Komplete Kontrol is close with the Fatar 110 - but has lights and integrates with Native Instruments and is the same keyboard Hans Zimmer uses!
I bought refurbished direct from Native Instruments - but it looked brand new - probably their way of getting rid of the last stock before MK3 was released.
Unlike the smaller models this model has fully-weighted keys. They are probably about as close to a real piano as you can get. (Same as the MKIII keys actually - the MK3 isn't much of an upgrade - essentially just a way to charge people more as there's no new features really that matter.)
The lights are REALLY useful - for example when playing back stuff from komplete kontrol software: it will show what keys you used which is nice for matching what you used before if you aren't looking at notes/etc.