somewhat new to the music scene, joined a band 2 years ago and started taking lessons to improve on whatever skills I learned in 5th grade...looking at a privia for my practice/band keyboard (i have an acoustic at home but difficult to practice at night when kids are asleep). can someone help me figure out the differences between the PX-S3000 and the PX-350 ? (kraft is running a good sale on the 350 right now, and it's cheaper the the PX-S 3000). Thank you !