Advice

Hi all. Have purchased Octavia vRS and the radio is rubbish!!! Any suggestions as to suitable upgrades??? The car works for a living i.e. it is my workhorse as well as weekend toy, so I need the bootspace. Therefore, any upgrades that don't take away much of the useable bootspace would be appreciated (don't want really loud system, just one that is better than the one at present). Also, any suggestions on engine upgrades would be useful. Again, not too over the top, but enough to make BMW drivers think twice before taking me on at the lights!!!