Saying buy a low end setup and then later upgrade does not really make it practical as lot of newbies think that's the route (including me 9 yrs back) and they jump in without knowing what this upgrade means or the cost of it or what should be the ideal plan to upgrade (i aint being argumentative but talking from experience of having done it twice in past and ending changing the entire system )
I also suggest, people who are on budget and want a home theater system and aint looking at audiophile standards should go for a HTiB as its pure VFM and my personal experience and some our friends have clearly made Philips 4750 a winner when compared to Onkyo etc low end models at 60% the cost.
So my two paise, if you are in upgrade path forget the low end version, research well, understand your audio needs, put a plan in place and then invest in a good receiver which is the nucleus and then go on the upgrade path slowly rather then buying a low end system. Sometimes its frustrating though