We have a kluger and love it, we JUST fit 3 carseats in it when we takje HotI's DD somewhere but we have 2 maxi rider's so if you had 2 thinner seats you would fit 3 easily.
I can't wait for DD1 to be in a booster (a few yrs off i know) so she can sit in the back and then we can have HEAPS of room upfront if need be.