It all comes down to personal preference.
If I had the option of putting in a reasonably priced Ford engine it would probably be prefered. Having said that, my $2800 LS1 will probably give over 350 Hp at the flywheel with computer and intake mods only. How much would it cost to do this on a Ford 5L?
Definately do not agree about the resale value of an LS1 Cobra in Australia. I think that over time the Classic Revival and Harrison Cobras will be sold at a premium price. How many do you see up for sale?
Just my opinion.
Ben