We're in the £29 seats and they are in the middle tier on the first bend so no need to pay £50.
We have always gone in the middle tier, but everywhere I suppose has a good view, although I've heard some forum members say they aren't keen on the bottom tier because it feels "too closed in."
See here. http://www.seetickets.com/speedwaygp/locat...iller2=multisgp
......and seating plan. http://www.speedwayworld.tv/cardiff2007/seatingplan.gif