I have 2800mhz Intel PC. I would like to purchase an AIO package and Hp seems to be the better option on the market at present. Within HP alone there seems to be so many models. Can anyone with experience of these models tell me apart from speed if there are any major differences, how they compare in reviews. I wanted to purchase the old D135 which has been discontinued, which if any of the above are a replacement for the D135? And, of the three which would you but? Which is value for money? Many thanks.