Installed the Focal mk6 speaker upgrade kit. Pretty impressed, a good improvement and pretty simple install.
http://youtu.be/dSAGHSc97_c
Dan, where did you get your kit from? Is it worth £260 over the stock system?
Yes. Its a huge improvement in clarity and punch. I am not going to bother with a sub.
Head unit is RNS510 so i could see the logic in adding a good amp...another 200 squid..but that is being a bit picky. The weak link is the ipod which drives me nuts as it has to be plugged in again every time i get in the car

Being an old git my music tastes are far and wide, Thin Lizzy, Metallica, kings X to John mayer, Elbow to MoS chill out compilations to Floyd to Alice in Chains to Adele....etc
£239 from Car Sounds and security, Epsom.