1- more characters made possible to marry (I love Karliah)
2- One really big house where I can display all my daedric artifacts off
3- A Vampire quest where if i become a vampire i can recruit followers (like with the blades) and run my own coven and have a war with werewolves
4- the ability to buy a fishing rod, a boat, and go fishing
5- to be able to buy a house that has a secret treasure room where i can drop all my gold and jewels and when nearly full i can dive in like scrooge mcduck
6- to be able to travel to cyrodil and morrowind
Awh, sorry u can not marry Karliah! LOL

i know how u feel cause I am playing a female Nord, so wish Ralof was marraigable in this game. He is the nicest and he saved my life from the start. Hey, he fights good and even cooks and chats with u in a nice tone, while he is doing it..And i even like his courage and his family He is the best Nord in the game so far. I saw some of the other marriagable Nord males and they are really rude and yuchy looking to boot.

i hope there is one more like Ralof somewhere in the game that is marriageable or i may stay single. If not then in the DLC? i hope they give the female characters more attractive partner choices like the male characters get to have with several attractive females to choose from already. Of course i could be wrong, and just have not seen them all yet, but so far the only other attractive Nord i saw that was nice to me, had long blonde hair and a cool warpaint around his eyes and was kind to me, but was not on the marriagable list! LOL!
Anyway, u have lots of good ideas, Valen. Like your secret treasure room too.