i have the envenflo tandum take me too stroller. and my kids like it. the 1 yr old sits up front because the seat is a little small and my 3 yr old rides in the back where he can get in out easy with the side step. sometimes it still seems a little big compared to the more expensive ones but it works for us. it also has a bar that can be flipped up on the back seat to fit most major brands of infant carriers and lost of storage in the basket.

but if cost isnt a problem i like this one (havent used it but would love to have it)

I have a JOOVY tandem sit n stand… It’s wonderful.. !! The bar is a bit taller so my husband can push it without slouching ! It folds nearly flat and is not quite as heavy as the Graco nor does it take up nearly as much room.. We don’t have a minivan or SUV so it fits nicely in the trunk of your full sized sedan… It’s easy to fold and unfold.. The only drawback(s) is that it doesn’t have a parent tray/cup holders and the underbasket is on the small size ! Other than that the price wasn’t bad and it’s been a good stroller… ONE STEP AHEAD makes one as well you can go on their website and check them out !

We bought a Phil & Teds single pram plus toddler seat. FANTASTIC and versatile. Great for 2 kids of different ages. They’re also really popular…and that’s because they are so good. It is a 3 wheeler, but that makes it really easy to wheel around. I’ve never had a problem with tipping.

Have you checked out Phil & Teds? Their sport double stacks two seats with a maximum weight of 88 pounds. (www.philandteds.com) It has three wheels, like a jogger, so it is easy to get around tight spots and comfortable for longer walks.

Thing is, it is also nearly $500.

Plus, your 4 y.o. is probably near the end of riding full-time. So you might want to look at the Joovy Caboose, which features one traditional seat with a space for a second kid to stand or sit behind. (http://www.joovy.com/pages/pd_caboose.php) It runs $180 and is sold at baby superstores. There’s also a lightweight version for a bit more.