i have driven 05 Accord 2.4 litre, and 05 Altima, 3.5 litre...from my experience, Altima is better than accord. Still have yet to try the camry as I am planning to get one within a 4-6 week period. If you are looking for power in the 4 cylinder category, then go for altima
Altima 4 cyl...175HP
Accord 4 cyl...160HP
Camry 4 cyl...158 HP
and if you want 6 cyl, then i suggest camry.
@ szuberi, SER altima is a nice car, but the difference between the SER and the regular 3.5 altima is only 10-15 horsepower, so why waste a few extra grand for that.