Not sure the sentra is an upgrade or not. I know they are reliable and seen them with over 300 thousand miles still on the road.
Shame the altima isnt AWD, then again neither is the civic or accord. I think my next car maybe a suburoo.
On the other hand Ive read the maxima doesnt hold its value so you can get a v6 sedan cheap, but I must not live in one of those areas.