I would say that to go out of your way to get a fast twist in a Swift, you should have a specific reason for doing so. It is your money so suit yourself, but I like to get return on investment.
I shot a normal twist Swift for years, and as long as you are shooting 55 grain and under bullets, there is no reason to go faster. Last year I re-barreled, and did go with a faster twist, but it was because I wanted to shoot different bullets. I shoot in the wind a lot and wanted to shoot bullets like the 69 SMK, 75 Berger, 75 AMAX, things like that. So I took my Dad's old Savage 110 in 22-250 that was shot out, and put a Shilen Stainless Select Match barrel with a 1-8" twist on it, chambered in 220 Swift. That is probably the easiest, and cheapest, way to get a fast twist Swift.
It does exactly what I wanted it to do, shoot heavy bullets. Honestly I am just now getting around to testing the 75's, because initially I shot a few 69 SMK's I had laying around just for kicks, and it shot them so well I just kept loading them. Been killing the snot out of coyotes with them too, so figured I might as well use them up before I start in on the 75 Bergers.
But really, if you are just going to shoot lighter bullets, stay with the std. twist.