i just bought a new dvd player and i can personally vouch that the pioneer 656a AND the phillips 5500s both have DTS decoders built in.
both can play mpeg4 files and SACD cds. but only the pioneer can play dvd-audio discs.
hope that helps.
the phillips is 5,990pesos (i think) while the pioneer 656a is 7,990. (i know... it's a bit pricey.)