I would probably prefer to buy new to make sure there are no underlying issues with the equipment, but I'm not against buying used if the equipment is nice and the price is right.
I checked the link to the Merlin speakers. They look nice but I do have a set of GR_Research AV-3's that I have used for the past few years and really love the sound of.
Is there a huge difference between the Merlin's and the AV-3's I have? (The AV-3's have all the crossover upgrades that are available.)
As for what I am listening too; pretty much everything. I know it's better to tailor a system to what you listen to most but I am willing to compromise to get something that will play pretty well for everything.
I listen to a lot of Neil Young and other classic rock. (Floyd, Journey, Fleetwood Mac, etc.) I have all that on SACD or DVD-A but will try to pick up on vinyl.
I also listen to a lot of electronic, i.e. KMFDM, NIN, Portishead, etc. Whereas I think the classic rock would benefit from a tube pre and amp, the electronica would be better suited to solid state equipment.
My thinking was going with something like the Ayre integrated amp and using the vinyl rig for the classic rock and a really good digital transport/DAC for the newer stuff.
Sorry if I seem all over the place with this but working for many years as a recording engineer exposed me to a lot of different music and broadened my tastes.