I'd go with a 4 wide or even a 3 wide. I have a Polyvend at a location and it has treated me very well. With that said it will be hard (but not impossible) to find motors and for the coin mech / bill validator I'd probably have to go to ebay but it has treated me well so far. Been there going on two years now without any troubles. Unless you can drop the $1,000 to $1,500 on a machine just see what your local classifieds have and/or craigs list and get what you can. I also have a 3015A like dogcow and other than the shelves being plastic and sometimes coming off the rail a little it has treated me well also. Relatively easy to find parts.
If you can get your hands on a AP7000 for a good price everybody seems to have parts and/or upgrades for that machine so you'd do well there. I'm not a huge fan of the interface there with mine but it is solid and works
I don't have experience with National but see parts advertised for it as well.
Open up the soda section and try to see what is going on. I know nothing about this particular machine but you can usually run a test vend while the door is open (although be careful so the soda doesn't drop on the floor and break.) Just try to see what is going on and if something is jammed.
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