2. Good point, but I'd rather avoid the terror of moving a 4x12 especially if you have limited car space which pretty much everybody with a car does. I would get two 2x12's because I think that looks cooler than a 4x12 and I can spread them around the stage if I wanted, and it'd still be easier to move than one giant 4x12. I know people do it ALL THE TIME and it's not THAT hard, but you know that everybody you see hauling a 4x12 is thinking "fuckfuckwhydidinotgeta2x12fuckthisfuckingthingisfuckedwhyisntmygirlfriendmovingthisfuckingfuckedgoddamnfuckingcab" as they grunt and stumble towards their cars.
No only people with orange cabs do that.
And buying cabs isn't really that difficult dude, take your head to a guitar store and try stuff out. Obviously dont buy them new right there. Get a good idea of what you like and maybe try to track down the same model used to save yourself some bones.
Have you even tried a Vader cab before? The way you were describing them sounds kind of like you're assuming how it'd sound without actually knowing.