Ask yourself this question:"Why would the other party want your Ludwig kit so much that they're willing to trade a top of the line newer modern kit for it?" Answer:Because they'll be rid of something to which they attribute less value, while gaining something they've long wanted to own.Don't be a chump!Anyone can always purchase a used newer drum kit.
I don't just look at how much a kit is worth, if I'm not happy with the sound of a kit, I'll get rid of it. I love vintage drums, especially Ludwig, but I've come across a few lemons. I've owned several modern kits that I also loved, but never had any real sound issues with them, I just get in the mood for something new, so I trade or sell them. There is no question in my mind, before even playing this GMS kit, that it will blow away the Club Dates. They may not have that vintage "mojo", but they are well crafted drums.
That being said, my "Dream" kit is not just the finish, but the sound, if I can find that right vintage Ludwig kit, I will do a trade, not because I necessarily think the Ludwigs sound better, but, I do like the vibe of vintage drums. There is definitely a coolness about them that I don't see in a lot of modern kits.