mercedes audio

[wolfetony]

hi there ive just recently purchased a mercedes c class w203 yr2000 on an x plate and its got a non standard cd player i want to put a mercedes cd player in place of this. ive looked at the audio 10 standard merc which i know will fit ok and probably end up buying. but i quite like the audio 20 version and i was wondering if it will fit in my car as ive heard that they only fit the facelift model 2004 onwards.the 3rd option is the audio 30 with sat nav which will also fit no probs would i need an antenna or any special wiring for this version having checked ebay for prices ive found that there is not a great difference in prices for any of the 3 versions any advice would be greatly appreciated thanks.