I know it is early to be looking at these, but I am trying to research as much as I can.  Does anyone have any recommendations on convertible car seats?  I have a Honda Element which has suicide doors and could impact our decision.  
TIA! 
                 
                TTC #1 since 8/09
BFP#1 - 9/2/10, EDD 5/14/11, Twins Hannah and Liam lost 11/7/10 @ 13w1d.
BFP #2 - 2/9/11, EDD 10/13/11, LO lost 2/13/11 @ 5w4d
BFP #3 - 5/9/11, DS born 1/13/12

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Re: Convertible Carseat Recommendations
I'd check here once you've narrowed it down to a few models for your specific car.
https://www.carseatdata.org/
I've always been a big Britax fan. In fact, my X got into a REALLY BAD car crash with the boys (totally and completely not his fault, but it easily could have been fatal) and the police officer said that it may well have had a different outcome if the seats weren't installed properly. I'm totally insane about carseat safety, and it totally justified it for me. Anyhow, I've always been really happy with the quality and weight limits of the Britax seats, the last one I had was a forward only, and went up to 80 pounds. I used the Roundabout for convertible and it was definitely roomy enough for the boys to be rear-facing as long as I chose. I turned them both forward around 18 months (this was back in the days before recommendation was until 2).
BFP#1 - 9/2/10, EDD 5/14/11, Twins Hannah and Liam lost 11/7/10 @ 13w1d.
BFP #2 - 2/9/11, EDD 10/13/11, LO lost 2/13/11 @ 5w4d
BFP #3 - 5/9/11, DS born 1/13/12
~*~My BFP Chart~*~Our Story~*~
~*~Labor Buddies with Sweet Turnip - Welcome Baby Girl 2/23/12 & Aluenna - Welcome Ivy 1/6/12~*~
I miss my Honda Element! We finally had to sell it when we had >2 kids, but what a great car!
Highly recommend Britax as well. We use Britax Roundabout for convertible seats and then move them up to Britax Frontier (5-point and booster) when they outgrow the Roundabout. Amazing car seats.
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BFP#1 - 9/2/10, EDD 5/14/11, Twins Hannah and Liam lost 11/7/10 @ 13w1d.
BFP #2 - 2/9/11, EDD 10/13/11, LO lost 2/13/11 @ 5w4d
BFP #3 - 5/9/11, DS born 1/13/12
~*~My BFP Chart~*~Our Story~*~
~*~Labor Buddies with Sweet Turnip - Welcome Baby Girl 2/23/12 & Aluenna - Welcome Ivy 1/6/12~*~
I'm seeing really good things about the Roundabout. Did it fit well in the Element and was it hard to get your LO in and out of it?
BFP#1 - 9/2/10, EDD 5/14/11, Twins Hannah and Liam lost 11/7/10 @ 13w1d.
BFP #2 - 2/9/11, EDD 10/13/11, LO lost 2/13/11 @ 5w4d
BFP #3 - 5/9/11, DS born 1/13/12
~*~My BFP Chart~*~Our Story~*~
~*~Labor Buddies with Sweet Turnip - Welcome Baby Girl 2/23/12 & Aluenna - Welcome Ivy 1/6/12~*~
Thank you so much! I read the reviews and they sound great. I am going to put one on my registry right now.
BFP#1 - 9/2/10, EDD 5/14/11, Twins Hannah and Liam lost 11/7/10 @ 13w1d.
BFP #2 - 2/9/11, EDD 10/13/11, LO lost 2/13/11 @ 5w4d
BFP #3 - 5/9/11, DS born 1/13/12
~*~My BFP Chart~*~Our Story~*~
~*~Labor Buddies with Sweet Turnip - Welcome Baby Girl 2/23/12 & Aluenna - Welcome Ivy 1/6/12~*~