On June 4 and June 8 I'll be flying IAD-LAS-IAD (connecting from and to BRU) in a A320. Any suggestions to which seats to chose?

I'll try to get into E+ but UA won't do this at the BRU ticketdesk for the IAD-LAS-IAD legs.

Since i'm +2m tall I hope there are seats left in E+ or that there are some decent E- seats

Thx