I've been collecting for approximately 4 years now. I've been a tech at 2 fields, a manager at one, and I never really ever stopped trading/buying/selling. I did the gunroom for awhile, see below, but I got kind of tired of how tacky it was. Most of it is crated in rubbermaids and closeted except for the occasional repair or upgrade, and collection photo. I rarely play anymore though due to the job.
And the favorite is easily the TM G3A3.