[teachermama]

I have owned all three of these at one time and still own two Boulevards and two Marathons, plus a Roundabout. My personal preference is the Boulevard because of the TSIP and the knob adjusters for the harness straps. It also has a lot more support for the infant if that is who you'd be getting it for. Both my two younger kiddos were/are extended rear-facers and it didn't/doesn't cause any issues with that either. Good luck trying to decide! (oh, and if price is the issue, I have NEVER paid retai for any of our seats. In fact most of them were at least $100 below MSRP, you just have to be aware and buy on sale with coupons! )