First off, the Yamaha P120 is a discontinued model and there are much better models out there now--so I personally wouldn't consider the P120. Based on what you said in your email you seem to be looking for a descent digital piano that isn't a toy but not a studio quality instrument either (because they cost a lot!). I would personally go with the P155. It's an awesome digital piano for the price (I think it retails for around $1100 or $1200). I did a review on this instrument which can be found here
. Also, here's a link to a youtube video showing off the P155
so you can hear it for yourself.