DR680_Mk2 is very hard to beat for value right now. Does everything you want. Love mine, although it's now a second rig recorder.
Level adjustment does work a bit differently than other recorders so I understand Jeff's comment, however I find the 680 makes it easier for me to rapidly adjust levels the way I want them than any other multi-channel recorder I've used extensively. It allows me to rapidly adjust the level of individual channels, of pairs, or of large multi-channel groups, quickly and easily without going into menus, and does not have a problem with accidental mis-adjustment. I wish level adjustment and channel ganging on my other multi-channel recorders worked the same way.
The new Zoom F6 has been much anticipated and is just now getting into the hands of users. Voltronic is one of the first here to use it.