I recently aquired a HK94, complete with both stocks and 8 LE marked "curved" magazines. I added the FBI polymer lower and HK FH, to help mitigate the "ugliness". I bought a parts kit for the inevitible SBR "hack job", but right now I am content. The MP5 is one of the best SMG's on the planet, though lack of bolt hold open device, ergonomic issues and price are serious drawbacks. Bobcat makes decent weapons, some are great....some are terrible. Vector makes a 10mm/.40 MP5 clone which looks promising and affordible, though magazines won't be.... The MP5 clone is more of a "collectors weapon" than an all out defensive firearm...actually it fills both roles very well. The 9mm AR is an excellent SMG which is reliable and affordible, not to mention it accepts the same components as a 5.56 AR. How to feed your 9mm is a consideration, as there are several ways to do it...all with their own pros/cons, so pick which one works for you. I lean
towards the standard Colt magazines, followed by the Oly Glock setup. 9mm AR's make great defensive weapons as they are realiable and affordible to practice with, not to mention 9mm JHP rounds are pretty potent. Another consideration would be a IMI or Vector Uzi carbine. The Uzi was the world standard and still is in some places. Its an excellent weapon, though less refined than the HK/AR, but usually less expensive too and every bit as capable. The Storm is my least favorite just because I cant get past its look/feel...otherwise its a great gun. The HiPoint 9mm carbine is your most economic choice, but 800-1000 dollars would get you a HK clone/AR 9mm or Uzi, depending on what you want. While I do own the HK, I long for an AR and intend to by a RRA 9mm midlength when I get the chance....A 9mm AR is pretty tough to beat price/performance wise.