I'm not saying to not use EZNEC, but I do recommend at least looking at 4NEC2, which is what my models above are all made with, as well. It is also completely free, unless you want to spend money on more capability (such as more segments) like with EZNEC... 
There are also things I can do that I haven't seen done with EZNEC, for example, the capacitor included on the imax antenna model in another thread...
Yes, I am biased, can you tell?
I had considered making a video series showing how I make models, how to test for accuracy, what to watch out for, ect. and posting it to youtube. The idea was to help others while shoring up what I think I know about modeling... Unfortunately I really haven't had the time...
If you have any questions with either of these programs, don't hesitate to ask. I'm willing to help you learn, and I'm sure Eddie is as well.
The DB