RD4 or RD5 Radio for '04 Hdi

[cancunia]

Has anyone installed an upgraded PSA radio?

I'm thinking of putting a replacement PSA radio in my '04 HDi and wondered if anyone has used an RD4 or better radio as opposed to the RD3 that mine came with?
I have an aftermarket Head Unit installed which works fine but I'm thinking about a PSA radio as I want the MFD to show the station etc, especially now that I have the larger 3 line display for the Trip Computer. I'd also like the stalk buttons to work again, so thought a PSA radio as opposed to a stalk interface.
I'm guessing that an RD4 will work ok and they're not expensive but will need an adapter for MP3 players so won't show track info on the display. Can't find any RD5's so maybe the next model up from an RD4 is something else?

Thanks