BD, I find a 3/8" blade serves me well for just about everything I do.:icon_thum I don't do much "tight radius" cutting. :nah: A 1/2" blade can be a bit large for some things, and a 1/4" is too small for me. T&E is the way I've learned.:confused_
I often use either a 1/2" or 1/4" blade on my 18" (really 18-3/4") bandsaw for most curves. I also have the Carter aftermarket 'Stabilizer' which allows even tighter curves with a 1/4" blade. I haven't gotten around to ordering any custom blades smaller than 1/4" (my saw uses 142" blades, which you don't usually find readily available in blades under 1/4").
For extremely tight curves I use an 18" scroll saw.