The Oppo is a great bargain for a multipurpose player, but does not compete head to head with newer dedicated entry level HiFi red book players. You are paying for video and multichannel audio DACs and design compromises that dedicated players don't have to make. I think there are other better choices unless you need to be able to play DVDs too.
For example,
New:
Music Hall CD25.2
as stated above, very nice sounding - resolution plus neutrality
Cambridge Azur 540C v2 (do not recommend v1 if buying used)
resolution champ if that is your bag - forward
NAD C542
laid back and musical, but a little rougher around the edges than the other two
Used:
Cambridge Azur 640c v2 (v1 very similar to 540C v2)
lots of resolution but smoother and more musical presentation than the 540 v2 - 2 DACs
NAD C542 (or older NAD C54X)
C542 on sale on ebay, C522 for sale on Agon for cheap
Music Hall CD25.2 (or older better model)
same as above only cheaper
Rotel RCD-970 (or newer RCD-1072 if available)
a little forward but good resolution, also on Audiogon
Musical Fidelity A3.2 just sold on Agon for $490
smooth and musical player
Some places to start.
For example,
New:
Music Hall CD25.2
as stated above, very nice sounding - resolution plus neutrality
Cambridge Azur 540C v2 (do not recommend v1 if buying used)
resolution champ if that is your bag - forward
NAD C542
laid back and musical, but a little rougher around the edges than the other two
Used:
Cambridge Azur 640c v2 (v1 very similar to 540C v2)
lots of resolution but smoother and more musical presentation than the 540 v2 - 2 DACs
NAD C542 (or older NAD C54X)
C542 on sale on ebay, C522 for sale on Agon for cheap
Music Hall CD25.2 (or older better model)
same as above only cheaper
Rotel RCD-970 (or newer RCD-1072 if available)
a little forward but good resolution, also on Audiogon
Musical Fidelity A3.2 just sold on Agon for $490
smooth and musical player
Some places to start.