My Best Options to place sound / speakers in all rooms

Hi all,

Bit new but here it goes I recently bought a new 3 bedroom flat and I'm looking to kit out I got the TV and all that sorted but I'm having a refit of all the plumbing, heating and electrics (dont ask long story! used to be E7 heating!) anyway...

I'm looking to have a media unit placed in a small storage area where the boilder used to be which can store music and possibly movies and be beamed to the tv and speakers. Id also like to place at least 4 speakers in each room so that music can be heared in every room and the ability to change track wihout going into the cupboard. Id be looking to update it via the computer I dont really want to have a pc in there just a stand alone system that can be sinked up to it and intergrated into the tv and media unit for the movies etc.

So I need something that can :

1. Be updated via the pc / wifi

2. Ability to hook up speakers to it and play in each room

3. Hook it to a media center so I can stream movies to / from it

4. Change tracks via remote

5. Possible to have radio / dab as well

Not sure if this can be done or not but any suggestions on kit or where to look would be handy! Or any firms that can offer this or anyone here! I'm based in Cardiff. I have a decent sized budget so I'm not looking to go to cheap.

Many Thanks