A 1.00 2-stroke or a 1.10 4-stroke are the maximum recommended engine sizes for this particular airframe. The Evolution 1.00NX would be one possible choice for this plane, however this particular powerplant is somewhat pricey ($169.99 MSRP) and doesn't share it's small siblings' reputation for reliability.

User reviews for Evolution 1.00NX:

http://www.rcuniverse.com/product_gu...?engine_id=843

You might also consider:

$119.99 - Super Tigre G-90 (www.towerhobbies.com)
$99.77 - SK90AR (www.kangkeusa.com)
$149.99 - Magnum XLS-91A (www.hobbypeople.net)
$109.95 - JBA 91AR (www.kangkeusa.com)

The SK90AR enjoys a 4.5 star rating, the Super Tigre G-90 and Magnum XLS-91A each have a 4 star rating. My advice is save $70 and buy a better engine.