If you want a pretty good Vox AC tone you could always look into getting one of the Vox Tonelab units. I have a Tonelab ST and the Vox modeling on it is great, much better than most of the other modelers out there. Also, on the unit you can bypass the cab modeling and then use impulses to get the cab sound you want. Just another option as you can find Tonelabs going for dirt cheap on Craigslist sometimes.