[Miths]

I recently bought a 40" Samsung M87 HDTV and a PS3 for Blu-ray movies and gaming.
I've decided to postpone purchasing a surround system for the time being - and aside from the expense of a decent complete system, living in an apartment and usually being up until daylight I'm also a little concerned about noise levels and neighbours.

So headphones it is for now - I've had a pair of cheap Sennheiser HD 515 for a while, but I've just ordered the HD 595.

One question lingers though. Am I likely to get a marked difference in sound quality through headphones if I connect my PS3 directly to a fairly cheap receiver (probably a surround receiver I could use for a future surround system, I've been looking at the Denon AVR-1306 and 1508 models for instance) rather than just plugging the headphones directly into my M87 TV as I'm doing now (PS3 connected through HDMI)?

With the HD 515's I've been getting two very different kind of results through my TV.
Flat and uninspired sound with slightly unpleasant shrill voices in movies if I just use the plain default audio settings on the TV.
Really impressive and broad soundscape and vastly more pleasant voices if I turn on the SRS TruSurround XT setting.

Given the second result, I'm actually a bit concerned that I would end up sorely regretting investing in a receiver if there's actually a chance it's going to deliver a sound closer to the first unprocessed result above, rather than the fairly impressive "virtual surround" the TruSurround XT offers?

Of course logic would dictate that even a fairly cheap receiver should beat the no doubt lacklustre built-in TV amplifier in unprocessed sound - but is it likely to match up to what that apparantly rather remarkable TruSurround XT system can deliever?
Or do most surround receivers come with their own set of DSP (that's the name, isn't it?) systems and settings anyway?

Edit: Just a follow-up after I've been digging around for more info. Sounds like Dolby Headphone is possibly superior to SRS TruSurround XT (leaving out what other sound quality impact a decent receiver may have over the built-in TV amplifier) - and it looks like the Denon AVR-1508 supports that virtual surround format.
Guess I might be tempted to give that one a try sooner rather than later afterall then.
Comments and advice will of course still be much appreciated .