From what I gather, his budget is a little over 5k.
Do you already have the Klipsch SW-10? I don't think they make that anymore... there is a "Sub-10".
I think if you like the VM 30, you should get one of the center channels in that same product line. I say this because the CS10 uses completely different drivers "bi-laminate organic fiber" vs "mineral filled polymer composite" and silk vs aluminum, I dont have any facts to back this up, but those tweeters might not be compatible with eachother, like, at all... and who knows whats going on with the other materials.