Unless you're into multi-channel surround stuff, or the DSD layer happens to be recorded from a different master than the PCM one, you won't lose anything. You just need to make sure the SACD is a hybrid, so a normal CD player can read it. But most of them are.
DSD doesn't sound intrinsically better than PCM. If both layers are two-channel stereo and the same master was used for both, you won't hear a difference. Not to mention that most (if not all) SACD players with stereo output convert DSD to PCM anyway.
Personally, I wouldn't bother with a dedicated SACD player unless I wanted to have 5.1 surround (and then I'd have to hunt down SACDs that are actually mastered like that). For standard stereo it's not worth the trouble and expense; it sounds the same.
But of course, this hobby teaches us that what's real and what our brains hear isn't always the same thing. If you're convinced that DSD is better, then the SACD layer will sound better to you indeed, particularly after having spent a lot of money on a dedicated player.