Skybox F5 upgrade to new box with EPG ??

Hi I have a F5 , all working fine with all channels. The EPG only displays the now and next for the channel you are on, then changes channel when scrolling through. I am now looking for something more comparable to an Amstrad Sky Plus HD box, built in Hard Drive 250-500 Gb, and better EPG. Budget is always a factor, somewhere less than £200, and not against 2nd hand. And something I can program with the Cam Code (basic to intermediate skills )

Can anything be changed on my box to improve this , if not what box shall I go for