DLE 20 or DLE 30?

I have a NIB Showtime 90 that I'm finally going to start to put together. Flying weight should be about 9LBS.

My field is at 2900 feet, in the high desert and I want good response but also want to keep it as light as possible.

Which motor should I use the DLE 20 or 30? All comments welcome!

Thanks
Chuck