I say you go with a Civic Si. It's much more sportier and faster.  Gas mileage will be less than the Accord coupe 'cause you going with a Si engine which outputs 197hp.  The Accord coupe 4-cyl gives you better mileage, about 22/31.  If you want a little bit more space then go with the Accord Coupe.  What year models are you looking at?? By the way, those engines are not V4, they are inline-4.  I haven't seen any 4-cyl engines setup in "V".  Good luck with the car shopping.