I used to have speakers like
these except mine werent a powered module.
And then i got the z-5500's and they are MUCH MUCH better, and MUCH MUCH louder then the Bose speakers i had, the bass is insanely good although at times the bass is too much so i have to turn the bass down a bit on the pod itself.
Although the pod doesnt do fm like you asked you could just buy an fm reciever and plug it in.
The pod has
1x Optical In.
1x Coax In.
1x 3.5mm in on the side
1x headphone socket on the side.
and EITHER 3x 3.5mm sockets on the back or 1x 3.5mm socket on the back for 5.1 from your computer soundcard.
Im pretty sure you could connect an fm reciever into it rather easily.
The z-5500's are a bit fidly at first and a bit annoying to get setup properly but for their price range they are a great set of 5.1 speakers.
Im really not sure if you could find any other decent 5.1 pc speakers for under 500 euro.