Whats the difference between all Dodge Challengers?

I was looking at the Dodge challenger cars. All of them look the same why are they all at different prices?? I looked at the Dodge challenger RT 2009, SRT-8 2009, and the SE 2009 what are the differences in them? |||I sell them, and the difference in price is the different engines. Of course, the SE is base model, it's a V6 engine, then you have your R/T and your SRT-8, the SRT of course being the 6.1l HEMI. There aren't alot of options on one of these, there is an upgraded tire package, the sunroof, the My GIG with Nav, these are all options. Also, keep in mind that since these are so new and alot of dealerships aren't even getting one, they are going for above sticker alot of places.|||power train ,each one comes with a very different power train in under it and the price changes with that,true they all look sort of alike but the power train they are supplied with decides on the price you pay for it,and there's different options packages that go along with the trim packages as well,the nicest one is the srt-8 ,that is the best one money can buy,good luck.|||Mainly the engine. SE's have a 3.5 V-6, R/T's have a 5.7 Hemi V-8, and SRT-8's have a 6.1 Hemi V-8.|||nothing is different in physical appearance really but horse power and MPG is.........also the price changes if u get the SRT-8 instead of the normal V6.|||check the options on the window sticker, they're probably not identical. |||engines and trim levels