RE: 2009 Lotus Elise, white base package. Not the base package. If you are to trade, get the SC. Otherwise you are giving up too much, stick with the Z.
According to
2010 Lotus Elise - Specifications, Pictures, Prices
"The big change is the addition of a new entry-level model, dubbed simply the Lotus Elise. The base Elise model comes with a 1.6-liter engine developing 134 horsepower and 118 lb-ft of torque. Although about on par with
many entry-level compact models, the Elise's lightweight design ensures overall performance is not compromised, with the two-door still able to scoot from
zero-to-60 in just 6 seconds. Top speed is capped at 124mph."