Hey, I know the guy in that video!

That's me! I'm glad to see that somebody is actually watching that. I haven't tried removing a factory barrel using the port entry action wrench, but it will probably work alright. I use the full action wrench to break the factory barrel loose just because it gives more leverage. And some of the factory barrels need a little extra leverage.

As far as the barrels go, #1 is out because it probably uses the pre 1967 recessed breech barrel where the bolt head fits inside a recess in the barrel (like a Remington). The other 2 should work fine though. $70 is awfully high for a used factory take off. I rarely pay more than $55 shipped for a factory barrel unless in it's in a highly desirably caliber (308, 7mm-08). Even then, I paid $65 shipped for a 7mm-08 barrel a few weeks ago. And I paid $45 shipped for my Stevens take off barrel in 243 a few months ago. Shop around and you will find a better price. Check out
http://savageshooters.com/SavageForum if you haven't already. You do need to be a paid member ($12) to view the classified section, but I feel like I've saved considerably more than that on some of the deals I've found.
And for the record, I have a couple of factory Savage barrels that shoot better than my Shilen and PacNor premium barrels. All of my factory sporter barrels shoot less than MOA, some much closer to .5 MOA. They might take a little load development to get there, but I think that most factory barrels are capable of that level of accuracy.
Good luck, and if you happen to have any questions feel free to shoot me a PM.
Andrew