Sounds like a good package to me. However, it depends on the condition of the several items in this package. If new when the 4200 was new, its good. If not new then, but in good condition (taken care of, no busted parts, good paint, clean, well greased), then it sounds like a good package. If this package is what you can use, and what you want, then you will be the one who has to decide if you can be happy with this package. If there are things in this package you don't think you can use, then possibly selling them is an option. If it is a dealer (doesn't sound like it, as they would likely part this package out), then you will likely have some recourse if something is not quite right. If not a dealer, then you will likely be taking the risk that all is in good order, and something obscure isn't broken.
If it would sell to someone else tomorrow, could you live without it? Could you find a comparable package easily at that price? Have you priced a new 4210 with new attachments, and compared the difference?