everything you have mentioned you can have working in rr, the info is about the forum , but not just this bit of the forum.
tv yes can be used and work in Europe , depends on the card or stick , there is a stickey in this bit of the forum about setting tv up. i have used Wintv usb stick with digital channels and works fine. Well the last time i tryed it anyway.
Radio , you could use silabs or get yourself a HD tuner from the states , the anologue side will work like a charm for you.
Sat nav again many chioces, Garmin , IGO
mp3 player , this is your choice RR supports many of the major players , Winamp , Window Media Player , Foobar, all mentioned in the stickeys. just select which 1 you want to use in the rrconfig.
This is also the same for DVD / Video players
As for the skins as you may of noticed there are a fair few to try , all of them will do the basics you require, except sat nav , not all are set for all of them. every skin has many other functions to them some are huge fully functional skins some just with the basics.
Basic answer yes everything you want can be setup and work . its a matter of search the forums for the info you require.
I would start with the faq'q and stickeys here in this bit of the forum. for satnav go to GPS section on front page of this forum. all you answers are there.