Some of the Mesa, Fender and Ampeg models are pretty good, and I say that as someone who dislikes using digital emulators. IK's JTM45 isn't bad either so long as you use a cab with vintage Celestions instead of the one they suggest as it's default cab.
The Princeton is particularly good (as are the Mesa Mark III and IV). It works well with harmonica too, if you keep the input volume down, roll off the treble a lot and increase the bass/mids. Which is pretty much what you need to do with the real thing when using it as a harmonica amp.
Unfortunately for me I've yet to find an fx/amp digital emulation package where I find the trade-offs don't outweigh the advantages the things provide.
Now, if there was a model of Neil Young's modified Deluxe, or even a tweed deluxe where the volume controls interacted properly.....