the new kia forte koup appears to be a good example, it will have 2 available engines (156hp 2.0 -34mpg hwy or 2.4 with 173hp, 32mpg hwy), nicely optioned but not overdone, and supposedly will start at around 15k...
trim levels might be a good way to prove the point, if you can find stats by manufactures on sales of each models trim levels. if there is a consistent spike of base model trim levels across the board, you could conclude that people want more basic cars..or you could counter with the pricing argument, but in the end people really want what they can afford, whether they like it or not ;)

