So you have
- Panasonic Plasma TV
- Denon Hifi system for CD's, DAB+FM radio & iPod dock for mp3s
- Panasonic DVDR with a hard driver recorder and freeview+
- Sky+ HD
- Blu-Ray player
- 5.1 system
Having a Mac Mini (possibly with some extra storage, depending on the size of your media collection) as a HTPC/Media server could enable you to:
Install
Plex, a free Media Centre program that can manage your music and movies. This allows you to organise all your music (ripped CD's, MP3's etc.), all your movies (DVD's currently, Blu-Ray when Mr. Jobs sorts his life out...) and online media (Youtube, iPlayer, TED Talks etc.) with an easy to use and customisable interface that is designed to be used with an Apple remote or wireless keyboard. It has some neat tricks like using IMDB meta data to display movie info (posters, synopsis, cast etc.) and also can recognise network storage (so you could stream music from an existing PC/Mac)
You could drop the Denon system and rip cd's to the Mac, use iTunes to manage your existing mp3's plus the new CD music and use online radio to replace DAB and FM.
Lose the DVDR as the Sky+HD and Blu-Ray should easily cover this, plus rip any DVD's you own to your Mac and use Plex to easily manage a movie library.
That just leave your with a 5.1 system, TV, Sky+HD and Blu-Ray as well as a mac mini to manage all your media needs. A far neater and more flexible system.
There is a load more on media centres in
this thread, including what you need, how to setup Plex, a couple of videos and some good hints and tips. It looks quite complicated at first, but download it and you'll find its really simple to use once you understand some of the quirks of the system (labelling media correctly is one of them)