We have 2 Britax seats, the Boulevard,convertible - can face rear or front, which has no cupholder (that is the ONLY complaint I have about that seat) but I found an attachement aftermarket one that works...and the Frontier 85 which is a front facing only 5 point to Belt Positioning booster, has 2 great cupholders. That is in our main vehicle for the kids, we take about 4 trips a year that are 10-14 hours in the car, each way, so it was important ot M. to have very safe seats and ones that are very comfortable for the kids. Those are the ones we settles on, and when my little guy outgrows the Boulevard, we will be getting him another Frontier 85, like my Big girl's, she LOVES it. Those will be our last 2 seats, as they will hold the kids up to 85 pounds, which is GREAT ( I think I was 85 pounds in like 5th grade, LOL!)! Another benefit to the Britax convertible is being able to adjust strap/headrest height without re-threading straps or even taking the seat out of the car, and the Frontier is similar. They are more expensive, but they are better built, more comfy for the kdis if you are ever going to be doing long road trips, and easier to install ( I love Britax latch connectors, they have a button like a real seatbelt, rather than the hook style Graco and most others have, which can be hard to hook and unhook) and easy-adjust for height as the kids get bigger, also usually have higher weight limist for allt he different positions, so you will be able to rear face longer if desired, and then in the booster, you will be able to use 5 point longer, use LATCH attachement longer, and use the booster longer in general.
In our other car, and when they were littler, we had a Graco infant seat, and still have a Graco Comfort Sport convertible, plus a Cosco 5 point to belt positioning booster. The kids only ever ride in that car for short jaunts to the store, or church, so butt padding/comfort is not as important...they have much less padding under the covers, just hard plastic covered by a little batting and fabric quilted.