If I was buying my first MG, I would probably buy an M11 as it is the cheapest, highly modifiable, relatively reliable gun that will do what you want. The Uzi is much nicer but I don't know if I could ever justify spending $7k to $8k for a toy whereas under $4k seems more economically palatable.
The only thing that bugs me is that it's cosmetics are between a brick and a shoebox with a short barrel sticking out, it is just a box. I like the looks of the Uzi much better and it's history is much more interesting. Back in the day, if I am not mistaken, you could buy a Mac for a few hundred dollars. Even back in the day, Uzis were never at bargain basement prices.