having been there for football and speedway, there is a good view and atmosphere anywhere you go, not sure what the speedway would be like from the bottom tier though which I think are the £29 tickets.
Personally i go for £50 tickets and get front row of the middle tier on the bends, worked for me last year so no need to change a winning formula
aisle seats too for 2007 , just in case i need to get some refreshments in
I think the dearer tickets are then on the straights