This is getting daft now.
You are giving poor advice and I really dont know why.
Specifically - you say you need 4 gig to edit video. THIS IS WRONG.
The vendors of my editor say 512 is fine and I recently went up to 1 gig and say NO CHANGE in render times or responsiveness.
The OP of this thread wants a family machine he can edit on and you say...
"First of all, Pro video editing systems (high end) will use two or more processors, not dual core but two seperate ones. so that means that you are now looking for a dual processor board "
This again is factually inaccurate and totally unhelpfull and irrelevant advice.
Since you appear to believe your expirience is valid and that people should listen to your advice I am afraid I have to counter it with this....
What editor do you use? What camera ? What sort of films have you made? How long have you been editing films?
I have been editing and making films for 4 years using serveral editors early on on a range of systems. I have had flings on everything from prem to fcp on systems as varied as celerons, dual processor macs and a three rack avid system at the bbc (all too briefly). My films have been widely screened and I have been asked to make films for all sorts of people for all sorts of reasons - rarely money - that isnt my main motivator.
I am also studying for an MA in documentry film and video and may well be the next Michel Moore (but less tubby!).
That is the background and expirience that informs my advice, that and an understanding for the passion that people have for this art and an understanding of the need to do it all within a budget.
To refocus on your car analogy- well I would say porches are driven by arrogant show offs who drive stupidly, have little care for the environement and derive pleasure from flaunting their obscene wealth. The reliant driver is probably an enthusiast on a budget whose car will likely still be in use after the porche has been pranged and written off as scrap - oh yea, and they both get stuck in the same traffic jams....
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I have two prejudices - I am anti HDV for consumer camcorders, and I eat mooks who claim to be pro wedding vidders and ask dumb questions.
www.zaskarfilms.com You tube channel 'zaskarfilms'
JVC DV5001e (big cam), Sony PC6E (tiny cam), Vinten pro5, PAG light, SM58, Sony ECM50, Sony C-76, 0.5x convertors for sony, Rode video mic, Vegas 7.