I feel the need to elaborate before people come at me, lol.
1. Dolby Headphone - It's a one trick pony in comparison to others. I know of only up to 3presets that you can set it to to customize it to you. It's a generic HRTF, so it may not work for you. You can also use whatever EQ is on the device providing the Dolby HP. It's only provided through optical with Dolby Digital 5.1 unless you get an older Harmon Kardon receiver. You'd be missing out on some nice tech goodies if you're going the receiver route, but it will do Dolby HP over HDMI LPCM for uncompressed lossless. Thing is, it's an ERTF, which is unrealistic. It also started out as a theater technology, but it works well for some in games. Dolby Digital 5.1 is the most compressed form of 5.1, meaning it's the worst quality. If you wanted the best of both words, be prepared to put down a huge chunk of change to get Dolby HP in a modern receiver.
2. Turtle Beach DSS2 - It's basically a poor mans Dolby Headphone/mixamp. Correct me if I'm wrong anyone.
3. THXTruStudioPro - Only available on console through the Recon3DUSB. It's similar to CMSS-3D, which is nice, but it's a USB/Optical Device, only capable of Dolby Digital. Has more customization as well, but also Generic HRTF. Next.
4. CMSS-3D - Only available on console using a rarer Auzentech X-FI HT HD card, but this card has absolutely terrible reviews. It's amazing if you get it perfect, but I'd just shy away from this. Check Newegg's and Amazon's Reviews. Again, generic HRTF. Nice to have MacroFX and elevation filters though!
5. Silent Cinema - Found on Yammie receivers. Has up to 23 presets, with different settings for each I believe. The RX-A710 has 17. Check the thread link earlier on in here for more info. This is also another generic HRTF, but, at least it's more customizeable, is a HRTF, not ERTF, can be found on modern receivers for a modest price, all while providing the highest form of LPCM. Hell, you even get a built in Adaptive DSP and DRC, with the latter providing a great option on consoles since it balances out all the sounds (so you can hear chat as well).
6. MyEars - Just look it up. Completely custom. You'd have to get a computer, then input the PS3 to it.
I rushed this a bit. I'll come back later and edit it. Gotta run! Hope this helps!
How do you use myears with an external input? Plz elaborate, I would def. like to try this.