I will bet the barrel on e bay will sell almost the same price as if you would purchase new.
I would go with the t/c barrel but would see if you can purcase it without the QLA . and a slow twist 1in 66
I did purcase a barrel for a gentleman that had a new 50 cal. hawkens barrel with the QLA :He stated he could never get round balls to shoot well and gave up and bought a new GM barrel,funny I also could not get this barrel to shoot RB,conicals it did excellent.