If you want, last year, Misa bought one ticket for me but the other, I bought it from
http://www.fdjp.com
It's an english site. Excellent website. Normally you have a possibility to choose your place. You can indicate the seat or arena and also the budget you have (I bought a place for 15 000 yen last year + 30% commission and I was in Block D: beautiful view in Yoyogi!). But not sure that people who work for this site can find your request exactly. But you can try!
Plus, the site sent to you by EMS your place at your home OR they send it at your hotel in Japan.
It's a really good site, believe me!
And if you need help tu use it, you can contact me!