According to Lotus U.K., the base model is 120hp
http://www.lotus-usa.com/pdf/04_Elise_Brochure(Elise).pdf
The 111s is 156hp
http://www.lotus-usa.com/pdf/04_Elise_Brochure_(Elise_111s).pdf
And the 111R is 189hp
http://www.lotus-usa.com/pdf/04_Elise_Brochure_(Elise_111r).pdf
They don't make the Exige anymore, so there's no factory specs on the web page but according to some articles on the web site, the range for that was 178hp-192hp, depending on what factory accessories were installed.
Anyway, my brother works for them so he gets to bring home demos every once in a while. (2thumbs)