Upgrading miniatures as squad members buy new wargear

Im all rev'ed up about building my new squad. I've got a bunch of Cadians and Catachans, even some Space Marine Scouts. I've been browsing through here and it seems like I'm going to want/need to upgrade weaponry or modify my fighters to represent injuries, bionics or mutations. We used to snap off the old weapons and reglue new back in 1995/6. That was way before they had neodymium magnets available. Magnets can be a pain, plus they spin in unusual positions. Do you guys represent new wargear and changes on your miniatures? If so, how?

For recruits I make models for the different setups I tend to use and try to keep them WYSIWYG.

Officers or big beasts I either make a clone with the new upgrades/injuries or magnetize. On bigger models I use pins and magnets. The small magnets are enough to keep the limb/hand attached and the pins keeps it from rotating.

I don't change out different weapons. I used to but was too much work.

just need to list properly on the squad roster sheet.

I thought about having very distinctive heads for my Officers and putting them on magnets. That way if their load outs change dramatically, I can do a body swap. I like both Daemonicus' idea and DA banks. I might combine both. Just keep recruits WYSIWYG and have spare in case of extra recruitment or starting over and modeling and the officers with magnets but always be sure to carefully list in shown items on the roster

unshown* items