Who needs a true amiga system these days?
Something like that would only appeal to a small number of people namely; amiga fanatics/hobbyists.
Simple rule IMO; an economically viable product is a product that can offer something the competitors can't offer.
That may be in terms of price/quality balance and or functionality added to that.
For the computing masses these days Windows XP on a x86 is practically unbeatable (perhaps in price is where somthing can be achieved). For people wanting an alternative there is the MAC, or Linux for those who like that. But amiga in the realm of 'common people' with X86 systems? Not for a price you will. For free people might take a look (WINUAE) but it isn't worht the 'common people' a dime.
If you are really determined to get amiga back into everybodies homes you need to look into new markets. Markets where the product can offer something others don't.