[Bldg-sim] Ebergy Plus and SketchUp

[Scott Schreffler]

Hello,
I am interested in learning an energy simulation software and need some advice from you experts.  I am architecturally trained with over ten years experience.  Unfortunately I am not trained in mechanical engineering and have only a cursory knowledge of a variety of the more common mechanical and electrical systems.  I have taken quite a few lighting classes. 

Which program would be the best for me in terms of balancing 
a. User-friendly for an architect and
b. Robust and commonly accepted standard for LEED et al.

Thanks very much in advance for your comments! 

Scott