Yeah, I think the Element would be pushing the weight limit of 5K with 5000mah packs but for Intermediate, 5000mah packs wouldn't be required. 4200mah should work just fine and that shaves about 6-8 oz off the total depending on the selected batteries.

For an initial plane, I wouldn't worry about being over the 5K limit a little. No one measures or weighs the planes at local contests anyway. You would give up a little performance at the higher weight but glo planes take off at well over the 5K limit with a full tank on board anyway.

Glo or electric, they will both work well. Just go with proven setups and you will really enjoy the plane.

Woodie
Team Acme LG