Of the software that is available for purchase for a reasonable price
(less than $200):

1. EZNEC 4.0

2. NEC-Win Plus

3. Antenna Model

is there a general consensus of the best of these?

Is it worth paying more for some of the features, e.g., EZNEC/4 for $600?

Are there others that are preferred?

What about free versions of the NEC code?

I am interested in modeling a helically wound antenna and so need a lot
of segments.

Thanks.

Thomas