Definitely the Gintama heroines at my sig and Kagura too!!! although even if i did have a date with one of them, they'll probably tire me out due to their personalities... Example:
Otae = will strike fear to get what she wants
Kyuubei = no holding hands yet or any physical contact with her will result to getting hip thrown
Sa-chan = will make you tire out because of her
S personality
Tsukiyo = absolutely 0% of alcohol on the date or she'll end up berserk mode
Kagura = will pull you around to the places you go with her Yato strength
Sui will be nice too
Since she is shy about her feeling and makes you wanna let those feeling out +
Her reactions and response when you tell her she is cute never gets old +
It makes you want to tease her more(Im not an S though)
Or
Karasuma Chitose
Damn that smile, it makes want to think that "I'm glad I got a date with you