check out my thread, you will get everything answered :

http://www.gamesas.com/index.php?/topic/1270770-uber-assasin-build/page__st__20__p__19301684__fromsearch__1#entry19301684

thanks for the replies
iv taken everything on board and gone with a stealth archer/one handed/light armor and $neak character. not going to use alchemy however would illusion be worth investing in?

i see an invisibility spell which would be extremely useful however iv heard when sneak becomes very high you can literally stand infront of a guard??????????