We had a Graco Travel system with my first son. We had our second son when my first was 18 months old. We bought the Baby Trend Sit-n-Stand stroller from Target for only $130. It adjusts for any carseat, rolls very smooth, and is compact when folded (more so than my Graco, even with the double seats). I think it maneuvers very well in crowded spaces, like at the mall. It has a large basket underneath, cupholders for the parents, as well as a cupholder and snack tray in the front when your baby grows older and can sit up in the stroller. The front tray snaps on and off very easily, so your child can get in and out of the seat by themselves (when they get old enough).
I love this stroller and have received so many comments from other moms when they see me with it.
My older son loved the fact he could stand up in the back or sit down. There is a strap that goes across the bars if you want to hook it while the child is standing, and when they are sitting down, there is a 3-point seatbelt.
The only downfall I could see is the front seat does not fold completely flat, but it does slant backwards enough for the younger one to sleep comfortably. That didn't bother me at all. My children didn't need to lay flat on their backs to sleep. I think they sleep better at an angle anyways.
I highly recommend this stroller, and for the price, it's definitely worth it! Truthfully, I would have even spent more for this stroller. It's great.