I went with the MP5 family as well - very versatile range of weapons, and the fact that it is the staple of special ops units world wide has to count for something

Also its a weapon that would be reasonably available here in NI if the shtf - its the standard longarm for the PSNI, alongside the HK33.
There are probably a few Sterlings kicking around over here too as that wa what the police used prior to the HK switch. Uzi's are great looking weapons as well, the Garda Special Branch used to issue them, but afaik they've been replaced with MP5's as well. The only other weapon on the list that I've come across was an old airsoft Beretta M12 that I owned years ago. Always thought it was a good looking gun with striking lines, but as for real life use/practicalities, I've no idea. Shoots a mean 6mm BB though