not so fast on the marantz
First of all, I think all of those prices are kind of outrageous, barring an impressive guarantee and excellent cartridges.
I'm not a big fan of the Marantz 6110. I have one. Seems to run a little slow, I don't think the arm is particularly great and, in general it just seems a little below par compared to other broadly comparable turntables I've encountered which consist of 2 P-mount Technics (underrated, in fact I have one such table I'd give to you but it is in another state from me at the moment until September), Technics SL-1700 (Mk1), Pioneer PL-115D, Pioneer PL-4.
In contrast to the previous poster, what irks me most about the Marantz is how much less free moving the arm is than the other tables I've had. Might be a maintenence issue though. Remember also that Marantz turntables are not actually made by Marantz. Not to say they are bad for that reason but they have no connection to their great receivers, for example. In any case, the 6200 is part of a different line of Marantz turntables that look to be somewhat more substantial.
I'd go for the Pioneer out of that bunch. They seem to be very well made turntables and if the automatic functions do break, you can just run it manually. If it's anything like the PL-115D, which it seems to be based on a picture I googled, it has a suspended platter, a decent arm and should be reliable.
I don't know anything about the HK but it looks pretty cool.
Be patient, ask around. Much better deals are out there, even without having to resort to EBay. I scored my p-mount technics (quartz drive and aluminum arm - not like the bd20's plastic one) for 10 bucks from my used record store because it didn't have a power cord, the Technics SL-1700 (outstanding table) from the same place for $40, was given the Pioneer which is sitting around in need of a belt, and got off of Ebay a beautiful Dual 505-II with Shure V15vmr for $80. I don't recommend EBay, though, because of shipping scariness and the fact that you never really know what your getting. My Dual ended up needing another $80 worth of work to get up to spec but it was still worth it due to the V15 and the excellent primary system I now have for less than $200.