I'm looking to buy a ticket but can't work it out!

Here's the layout: http://media.ticketmaster.co.uk/tm/en-gb/tmimages/venue/maps/uk5/14333s_a.gif

For example, Standing Block A is £10 more than Standing Block D, but to me, Block A seems exactly the same (if not actually slightly worse).

I want a floor standing ticket but they're all sold out, and I can't work out where the best place to get a ticket from the rest of the options available.

In short, if you have a spare floor stnading ticket i'd be happy to buy it from you.