Better late than never. I kept this request on purpose because I was looking for the same thing for shower present, so thanks for making the request.
I've taken alot of these comments and did some research. I've found that the Baby Trend Sit and Stand seems like it will be tbe best of this class type. The back seat folds up and a platform will appear leaving room for a toddler to stand and ride if they choose. The comments on the websites say that this is one of the only ones that will fit the Graco Infant Carrier. I reviewed the Graco DuoGlider and a person commented that her Graco Infant carrier didn't fit in the stroller very well...which is wierd. Anyway, so I decided that I will be buying a Sit and Stand.
The trouble is that I couldn't find one in a store to look at. Target carries them but the stroller is only available online...which cost me an extra $50 to ship it within 2 days. OUCH! So, if this is the one you want..plan ahead if you can so you can avoid that shipping charge. Good luck...I hope this isn't too late.