And all of you are missing on very important factor.
Both cars are aimed at differnt markets.
The EX Civic is not Honda's answer to the performance FWD Market, and is instead a nice comfterble well apointed shopping cart with a bit of punch when you need to get on the free way in a hurry.
The SE-R Spec V Sentra is Nissans small compact sports car for the US market.
Most people looking at buying a new EX Civic are not looking at the Spec V sentra, and generaly vice versa, unless they want to spend some money on the Civic. (like an engine swap)