Homebrew..ish HP boxes as servers..
Couple of P4 HP D530 3.0GHz boxes (off eBay for ~£80 ea)
1 x SME server for..er files; email; personal storage 1TB drive (backup to ext drive). Done sterling service for years (with updates/upgrades) and just works. P4 has gigabit ethernet
1 x Mythbuntu box with 3 Hauppauge DVB-T cards 1TB disk; sits in cellar; backup to ext drive by eSATA (only approx 2.5 hrs...) when I feel it needs a recent image. Reason for this later.
Ther servers are 24/7 and they are not particularly low power but they are very quiet boxes; been very reliable and don't run full bore (and very cheap)
TVs are: 4 x mixture of HP D7900 USDT + Zotac mini-ITX (in Akasa crypto cases-small!). These have decent enough video output (DVI) for TVs which are 17in to 23 in monitors (off eBay again). All these have USB Hauppauge remotes and run Mythbuntu (frontends only - boot OS and it will find the server). All these on SSDs so very quick boot (under 15s). Modified LIRC file means the remotes can switch off picture but keep TV running (great in bedroomif Misses want TV/Radio sound but I want darkness for sleep!). Zotacs need active cooling or run too hot so need slightly larger CPU+Case fans with down rated speed.
Only problem with all these is the Hauppauge USB Remotes-work fine with Zotacs but for some reason all HPs (diff boxes/processors) crash X to terminal panic if the rooms gets cold- really irritating in winter when kitchen PC dumps out - easier to reboot. Works fine now it is Summer!!
All these are linked by wired ethernet in the house - gigabit input to switch from Media server and SME box - 100mBit to the rest of the house (18ports used + spare) . I have wireless but only use it for the Mythremote app on my phone to control the mythfrontends or to program recordings whilst watching TV/film/recodings/Videos/music from frontends. DLNA client (Skifta) on phone finds mythbox OK - just a bit skimpy on how it can search (Skifta issue). Streams video to phone/tablet fine (probably because nothing else is on the wireless!).
Reason I backup whole Myth server disc is when I go on holiday; I copy the ext backup disk to a 1TB 2.5in drive and put this in another HP D7900 USDT. Take this plus monitor+wirelessN router/switch+cables in a small laptop/work case on holiday (house in France - no telephone/broadband yet - long story). Just tell the wireless router it's now my 'home router' by address; boot HP and all recording/music/videos now available if we get bored. Use Mythremote on the phone to control this holiday box - couldn't be bothered sorting USB remote - particularly as we do stream more to phone/tablet on holiday from out of sight of the mini-server