I've been so busy I forgot to update this.
I got the Castleford set off Amazon from 4noggins. I was very pleased with their quick service, I'll say up front. And I really like this set, too. It does a great job of getting in there and getting the cake out of estate pipes, whether it be just a little that needs removed or a ridiculous amount. I had read many reviews and comments saying that the handle was cheap and broke easily, and other negatives but I disagree with them. Seems like it would take abuse to break the thing to me. The only thing I would call a negative is not being able to adjust to "in between" sizes, and that may be just my personal thought only.
I picked up a vintage Italy made buttoner type of the bay, too. I see why they are so popular now: it's great, the el-cheapo one I had was terrible.
I think in the future I'd like to add the Senior to my arsenal. It seems like it would be nice to be able to get those sizes that are in between the Castleford bits and I think Senior's adjustability would allow for that.