Eric, I currently use a KC with a 5" throat. My "go to" blades are generally 2/0 to #3, but I keep 6/0 and 8/0 on hand for really fine cutting, and #3 and #5 for the thicker stuff.
The jeweler's saw, for me, is a lot more accurate than a hacksaw - never been good with one. Consequently, I built several airplanes, cutting the majority of the 4130 steel and various grades of aluminum with my trusty old jeweler's saw. I think that the thickest I cut was 1/4" and 1/8", but almost all the other stuff was .032 to .062. With that saw, it was very easy for me to cut to the center of a red sharpie line, and eliminate a whole lot of filing - couple passes was all it took to eliminate the saw marks.
I generally buy my blades from Rio, and buy a gross at a time.
Best of luck with your project- don't cut your thumb as Idid!