altima is ok power wise but it feels not very stable. never driven maxima, i am sure it will be alot more expensive. Go with accord 4cyl. It will be a good start for power and i think there will be alot more aftermarket for it casue it is k series. finding an after market for 6 cyl is pain. and for the price of 6cyl you can install a turbo and make a same or more power. if they make same power i rather have turbo then 6 cyl. u will run faster then 6cyl if u get turbo if u r getting an auto.