Regarding Lexicon hardware units:
The 480L and 960L (recent model) are the most dense sounding units
The 300L was newer and more hi-fi than the 480... but not quite as dense
The PCM series was a cut-down of these units (less dense than the L series)
The LXP series was a cut-down of the PCM series (less dense than the PCM series)
The PCM software reverb sounds great.
That said, it doesn't have the super dense sound of the 480L/960L
As was mentioned, the Relab LX480 is (currently) the closest you'll get to the 480L in a plugin... but it's currently limited to a single Hall algorithm.
Lexicon reverb is known to be dense/lush.
Even though the PCM series isn't as dense/lush at their top-tier hardware... it's still luxurious sounding reverb.