'cuz your intuition is to ask for piano-buying help at a political website. That intuition won't get you farther than your luck. You might receive some sympathetic anecdotal advice that helps you out but you are relying on luck.
There are numerous buying guides out there, put together by people who have thought the issue out and have good knowledge of the technology. My advice is try one of these.
One other thing, once you have browsed a couple of these guides and understand the basic decision points, ask someone who plays piano well to help you out, maybe even go to a showroom with you to help you learn to "hear" the features that the buying guides describe.
If you want anecdote: I bought a Yamaha P-150 (not a current model) but there's no way I could explain it's pros/cons that would compare to these buying guides.
In no particular order, ( I scanned them; they all look useful)
http://www.amazon.com/gp/richpub/syltguides/fullview/R1B69G1JW14G6V
http://bestdigitalpianoguides.com
http://www.sweetwater.com/insync/home-keyboard-buying-guide/
http://www.digitalpianoreviewguide.com
http://thehub.musiciansfriend.com/keyboard-buying-guides/pianos-and-keyboards-how-to-choose
http://www.bhphotovideo.com/explora/audio/buying-guide/bh-2009-digital-piano-buyers-guide
http://www.tuition.ridgwick.com/buying-a-piano.php
http://erpiano.wordpress.com/2013/02/05/best-digital-piano-between-1000-1500-px850-ydp142-f120-mp10/
http://digitalpianoreviewssite.com/digital-piano-buyers-guide-tips-on-purchasing-a-used-digital-piano/
So good luck!
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