Well the speaker choice largely comes down to the music you listen too.
Value for money that can easily handle power sound great and plays pretty much any kind of music,
My personal pick would be the Rainbow SLX 265 Deluxe.
If you nave more money to spend, them perhaps go with Hertz HSK163.4's as a full 3 way replacement.
Or you can get a Rainbow make an IQ series of the line-up for mk5 specific. But the spacers don't fit 100% correctly out of the box. Little mods are required.