The DMP-BD35 is superior to the SC-BT100 in every sense - sound, dvd playback and blu-ray images. No comparison.
How do I know? My brother foolishly spent almost £1k on this silly system and is now regretting it very badly. He will now be going the separates route and getting a BD-35 to start with.
It's a 3 star product as reviewed by the experts here. Don't be foolish.