i suggest xperia pro as i also bought one just to get the feel and understand the fuss on android. unique design as expected from sony but not a standout like n9 but at least not generic like htc, moto and samsung. it got the best layout of a qwerty keyboard for me. not too many unecessary buttons and the arrangement is decent.
it may not be a dual core but dual cores are just great if you're playing games with high graphics or resource hungry apps. otherwise, it's not groundbreaking having a super phone if you're just using it for fb, twitter and the likes.
amoled might be better but i like s/lcd because it'll not gonna cause screen burn-in and bravia engine really makes images great.