So for now we decided to go for an Oblivion-style panel first (tabs at the bottom to switch between buy/sell, give/take etc). If that's how it was in oblivion, i dont really remember

https://picasaweb.google.com/lh/photo/HZBCYnmADV0HyE9iHuBQlNMTjNZETYmyPJy0liipFm0?feat=directlink
https://picasaweb.google.com/lh/photo/6ef342aQz4TeZ-lbzeajTdMTjNZETYmyPJy0liipFm0?feat=directlink
Except for the icons it's pretty much done already.
I'd still like to do a split-view like in fallout, but this would take much more time. Implementing the tabs on the other hand was relatively easy.