Hey Sherman105: What do you mean add the M113 to the list? It's one of the most successful APC ever. Solid, flexible and reliable design with loads of capacity. It is not the designer’s fault that people keep trying to use it for things it wasn't intended for (i.e. urban combat). In situations like that, you're better off dismounting or, like you said, converting an obsolete tank chassis to APC.
Other vehicles to add:
British Matilda I - Well armored, but slow, underpowered, mechanically fragile and under gunned - only 1 machine gun and no way to up-gun (ooh that describes a lot of Brit WWII tanks, doesn't it???)!
M520 GOER - Big old amphibious cargo truck with no suspension (it used is oversized tires to take the bumps). Liable to bounce excessively (and possibly flip) if driven too fast without a full load on board. Replaced in a hurry in the mid 80s by the HEMTT (my unit in Germany had 5 tons in lieu of GOERs and we considered ourselves lucky!)
I'd rather be a Soldier with a mule and mountain gun, than Knight of old, with spurs of gold, or Roman, Greek or Hun. For when there's trouble brewing, they always send for me!
Mortui Non Mordent - Celeritas Et Accuratio