Does this count as a mod?
I know someone here bought the Lidl one a while ago- well, now Aldi have one for under £50. It's not half bad either. Does all you'd expect and reasonable sound quality, plus takes a USB stick or SD if MP3 is your thing. It even looks OK. There's silver (yuk) and black versions.
Only compalints? I had to take a dremel to the back of the Fabia's dash as the unit was a bit deeper than the standard one, and the wiring loom didn't have swappable power feeds- but with a small screwdriver you can ease the pins out of the supplied loom to fix that.
The music streaming from my N95 has a bit of digital background noise, but I'm not planning on using that much.