This isn't necessarily 'swap' it's 'in addition to'
I'm through selling guns; I'm only going for quality at this point in the game, and don't want to pick up anything I'll 'regret' and want to ditch. The Kimber was bought on a budget; at the time, I wanted something all steel, compact, and in .45, and the UC met the bill well at $800.
The STIs are $3-400 more than the UC; not unlike how, at the time, I didn't go for an Operator simply based on cost. I've got more 'play' money these days, and I've had a couple people go on about the Shadow, so it's an idea I've been tossing around. But I certainly don't plan on parting with the Kimber even if I did get an STI.