Detecting iPhone/Pod/Pad generation

I am currently detecting I Generation by

 if( iPhoneSettings.generation == iPhoneGeneration.iPhone )
 {
     //Its a first generation iPhone
 }

However, this now as you can expect is becomming quite a long series of if statements, and I'm thinking there must be a better way to do this.

Is it possibile to say if IDevice is less than or equal to IPhone 4S generation then do something, else do something else? I guess that wouldn't account for iPad and Pod's though...

Any catch all solutions? Or is the long list of if's the best way to go about it?