Engines in this class include the Merlin 90, JC Rabbit, Wren SS, and Evojet 90. They all weigh about the same but from a power/weight standpoint the Merlin, at 95N, would be the best choice.
Some manufacturers advertised numbers are a bit off; some give bare engine weight and some give the weight of the engine with the mount and wiring. You really need to be concerned with total installed weight. I own both a Wren SS and a Merlin 90. Both weigh very close to their advertised weight, with the Merlin total installed weight is a couple ounces lighter than the Wren. My impression from what I've seen and read is that the weights of all 4 are close enough that it is not worth worrying about. At 95N the Merlin is the clear performance winner. Throttle response is also very good.
http://www.jets-munt.com/pb/wp_b214c...79991503508849
Joe