Becker Grand Prix 7993 rated at 4 x 30w 4x 18w RMS
Becker are right up there as far as sound quality are concerned - one of the best.
I'm a little ignorant as far as mk3s are concerned, but if they have seperate tweeter, obviously it's worth going for some components, If not go the co-ax route as recommended above.
Shame you don't want to amp - would make a world of difference. Becker + good quality amp + quality speakers = amazing music!