The biggest mistake in choosing the equipment is spending less than needed. The second biggest mistake is spending more than needed.
If you eventually go with LAMM and later want to add a preamp, this preamp will almost certainly be all tube LAMM, could usually be found for $6000 or so.
If you also consider older Rowlands, I suggest you start a separate thread specifically about them. Some people heard them all with different speakers, and not all Rowlands were great.