Yes with regards to the flat bottom wheel, I think that would be the one I end up going for. I did watch one or two on the bay, but they ended up going for silly money in the end so resisted. I will have a look through the Audio section and take a look at the audio upgrades, and those will be on my list very soon. The unit I have in at the moment is just the RCD 500 with no MP3 capability, so that will need to be changed soon for one of the newer units. Once I get my head around sourcing the parts and researching how it's fitted etc.