Alrighty, let's begin...
Quite a few people here swear by the Cubes as good solid state amps. They pop up on Gumtree quite often, (do you do 2nd hand goods?). I myself am not a fan, I have my reasons. :-\
I have played a Mustang II as well, dunno how the V2 model is in comparison to the first gen though, and it blew me away. Nice cleans, and it takes pedals well. A little fizz but that is to be expected at higher volumes. One of the nice things about the Mustang is that you can create your own patches on a PC and upload them to the amp, this allows you to switch through them on the fly.
The equivalent Vox amp would be one of the VT series (the 30w one I think?) they have a 12AX7 tube in the pre-amp section to try and recreate some tube mojo. Vox amps are solid as anything, and the VT series do quite well to create some classic tones. I better stop or the rest of this post is going to be me punting Vox products.
TL;DR:
Cube - Most people like it as a solid practice/gigging amp. Great features for the price.
Mustang - Nice cleans, little fizz. PC customizable patches.
Vox VT30 - Tube driven pre-amp section. Multiple patches. VOX! VOX! VOX!
A few questions:
Are you going to be gigging with the amp? (Jamming with acoustic drums?)
Budget? (If you don't mind sharing that is...)
Would you consider spending a little more on a tube amp? (This is my main question.)
You may want to take a read through this thread:
http://www.guitarforum.co.za/amps-speakers-and-valves/advice-needed-for-a-new-gigging-amp/
I was in a similar position to you a while ago.
And this one:
http://www.guitarforum.co.za/guitar-gear/buying-your-first-gear-the-smart-way-the-singemonkey-approach/
I know it is not your first gear purchase, but you may find the section on amps helpful.
Good luck.