Another vote for the Gmajor II, was a bit confusing at first but that was because I thought that you could start with blank patches and work from the ground up, and that's not really the way it works, you just edit pre-existing patches however you want and then save them to your own preset...
It's super easy to use and the effects really are pretty damned good....
Keep in mind though, there is definitely a bit of signal "change" when putting it into the serial loop of your amp, I don't really want to say signal "loss" because that wouldn't really be accurate, there is just a slight difference in sound, I actually don't mind it at all with my VH-4 and have actually come to like the way it makes the amp sound.
If this is something that is going to REALLY bother you, make sure you have some type of switching system that allows you the bring the Gmajor in and out of your signal path...
....OTHERWISE you have to run it in a parallel loop on Kill Dry, and to be quite honest, over half the effects sound like absolute shit when running it that way...