Whether it is a waste of the speakers will depend on what you get. I think that what Linn would recommend, and I certainly don't speak for them, is that you invest in the front end and work your way downstream, rather than start with the speakers.
However, if you are hell bent on getting the 140's, then look for a used Majik integrated amp. That's the old Majik amp, not the newer series. They're dirt cheap used, as far as Linn prices go, and would be an excellent match. It's a bit underpowered at 33 watts, but it can be used as a pre-amp only if you later want to add power amps as you build your system.
However, if you are hell bent on getting the 140's, then look for a used Majik integrated amp. That's the old Majik amp, not the newer series. They're dirt cheap used, as far as Linn prices go, and would be an excellent match. It's a bit underpowered at 33 watts, but it can be used as a pre-amp only if you later want to add power amps as you build your system.