We Are Scientists, for sure! very upbeat and sing-a-longy, give these a listen, Nobody Move, Nobody Get Hurt, It's A Hit!, The Great Escape and Inaction.
Arctic Monkeys are very Strokes-esque also. Pretty sure I don't need to recommend any of their songs : ), also their new album is very impressive.
You could try The Rapture too (you have to listen to Whoo! Alright-Yeah...Uh Huh

!)
Maybe try the Klaxons also, their album was upbeat and I really like it, stand out tracks are Golden Skans, It's Not Over, As Above, So Below and Totem On The Timeline.
Not so upbeat, but still very good (my two favourite bands) are Bloc Party and Interpol, if you want to try some Bloc Party songs I recommend Helicopter, Banquet, The Prayer, Hunting For Witches, Like Eating Glass and Waiting For The 7.18. For Interpol you could try Slow Hands, Narc, Obstacle 1 (very good song.) and their new one The Heinrich Maneuver.
Again, upbeat, are Hot Hot Heat, a fun band with a lot of catchy songs, try Bandages, Talk To Me, Dance With Me, Middle Of Nowhere.
OK! Good Luck
