After i get married in September, I may have a bit of cash left over and am thinking about a new Head Unit and some half decent speakers. I don't know a lot about car stereo equipment so firstly need to know how much am I likely to notice the difference?
I am not interested in a sub, just a decent set of speakers to replace the standard VW items. Car is a Bora TDi Highline and everything is completely standard at the moment, including the double din head unit. It's got a tape player!!!

What sort of prices would I be looking at? Don't have a budget at the mo - just need to mull it over in my head...