Well the Si is the 'race' version of the Civics. (previously known as the SiR). The CX, DX, EX, LX are pretty much similar to one another.I personally like the sedan based on 4 is better than 2, I would base a sedan vs coupe decision on your routines as in what you do, who you take (in terms of numbers), what you take (in terms of size), etc.A Civic is a good, reliable car.