I am going to add my vote for the Baby Trend one. I have had mine for about 3 or 4 months and I really like it - I have an 11 month old (I REFUSE to say that he is almost 1!) and an *almost* 4 year old.
They both do very well in it. Infact, I took it on the metra today and went downtown and we went all over the place downtown. It was great - my big guy could walk for a while and then sit/stand when he wanted. Easy for the older one to get in and out of and secure enough for both.
I agree . . .don't expect miracles in regards to weight and foldability, but I am really happy with this stroller (as I had the Graco duo glider . . .that thing is a BEAST). I like the size and weight of this and its really easy to "drive" and makes turns easily.
Congrats on your 4th!!
B.