I used Seatgeek when I was over there and it worked great, you can filter based on price and see exactly where the seat is and the view, it also includes the tax which is good as it shows you the actual price that you will pay. Just make sure you filter out any tickets from a third party provider, I ordered some that were re-sell and the lady had to email them to me, it worked out fine but much easier to just buy them direct and you then get the electronic tickets as soon as you pay.