Ok... considering doing a 9mm SBR with a suppressor. Mostly for fun but could double as home defense (if I don't reach for the shotgun, AR, m&p 9mm, etc.).
My first love is and always will be the MP5. An MP5k would be ideal, but the design is old and the guns are very expensive if you can find them. Clones of varying reliability are anywhere from $2500 - $5000. I've also read about issues running different grain weights. That said, it's an MP5 and probably wins the coolness contest.
Intriguing and much less pricey is the CZ Scorpion evo. I like everything I read about it subject to a few quirks, and the starting price is in the $700 - $800 range. Obviously. Lot cheaper and more modern, but no nostalgia wow factor.
MPX looks too much like an AR. Kriss Vector doesn't really do it for me. Kel Tec sub 2000 don't like the look. Not really sure what else is out there.
What say you ATOT?