Thanks for the input, Duck. I did see the iBox, but I can't (efficiently) use it on my little table saw and it's more than I really wanted to spend, anyway. And yeah, I agree that box joints will mostly be used for, uh... let's say "utilitarian" stuff.
Anyhoo, I did end up talking to a guy selling a D4R and F2 bundle yesterday, and convinced him to part with the F2 and all of the necessary guide bushings for 100 bucks. I'll play with it when I get home in a few days, but I think that ought to have my box joints needs covered.