Glenn;
I just (2 months ago) bought #6121 myself. The new one is supposed to be more accurate. I think it has a few more options also, but can't remember. The new one costs about $8 more than 6121. Go read the review at http://pmms.webace.com.au/reviews/vehicles/dragon/dr6182.htm
It looks pretty cool to me, but according to the review, there are a few "gotcha's".
(I'm still going to build my older one, too.)
Good luck,
Bill
Bill
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DML M4A2 Red Army
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-- There is a fine line between "hobby" and "mental illness". (Author unknown)