My Civic is older (a '99), but we've been fine with our Britax Marathon, which is a highly recommended seat on here for almost any vehicle.
The biggest issue is that it doesn't leave much legroom for the passenger when placed behind the passenger's seat, and it would have been impossible for us to drive the car with it installed behind the driver's seat while rear-facing.
We've been using ours for almost 2 1/2 years and we're still happy with our choice. And each of our girls like(d) the Marathon better than the Snugride, which was their first seat.
DD#1 "JellyBean" 6/08
DD#2 "Ha" 6/10
"Theory is great, but as I'm in the trenches of diapers and dishes and ear infections, I try to relax and focus on what's most important: love."--mjs64