Well, truth be told, I'm not a big fan of Pro-Logic, especially on straight stereo audio. The splits do very weird things to the sound, a process referred to as psycho-acoustics. And to me, if anybody actually enjoys what it does, then their truly psycho! lol
Other sources that actually include an intended Pro-Logic mix are rare these days, so I wouldn't put much emphasis on that at all, if it were me. I'd focus on a good 5.1 setup, and plan to utilize it on exclusive 5.1 material. I even have a few discs that have 5.1 created mixes from stereo sources, and it still just doesn't work well.
If you really want to go that route though, most basic HT systems will offer the Pro-Logic ability and most will create similar results. I have a Sony setup that has some very creative Pro-Logic algorithms, as do Kenwood and Harmon Kardon to name a few. But again, musically, they could be better. EQ is the key here, and admittedly, I haven't spent a whole bunch of time trying to make these systems more musical. Given some proper attention though, I'm sure it can be done with acceptable results.
WP