Hi Everybody. Just for those who are currently considering these models the difference between the two is very little. I have been able to see them side by side, running the same programme and in the same format and I could not tell the difference. Cosmetically they are similar also. The 506 affords an additional HDMI socket otherwise all other sockets are as on the 505. Currently you can buy a 505 for just under £3000 including delivery in comparison to £3250 for the 506 including delivery. Lastly the 505 does come with a standard two year warranty (except when sold by some stores: the price quoted above includes it), but the 506 does not (value approx £200.00?). Is the 506 is worth the additional £250 and a reduced warranty period? Well Pioneer say definately but I am not so sure, but then I bought a 505!! Perfecto! Chris.