Brian, Had you considered a Pentax? I have an older Pentax K100D with 6MP which takes decent photos, came with a Sigma lens for about $600, and I believe you can get the current versions with up to 15MP for about the same money (I bought 2 years ago).
I use a fair few Practika/ Pentax lenses with the camera because a)  I'm a Luddite and b) you get a lot more lens for your dollars with old prime lenses than with new zooms.
The Praktica screw to Pentax K adapters are cheap and have no lens elements to degrade the picture.  ALL Pentax lenses, including screw mount, will work with the Pentax digital bodies, but with some limitations (and these will apply to Nikon adapters as well, or more so):
Screw mount lenses can be used with MANUAL aperture and STOP-DOWN metering only (but autoexposure will deal with whatever you offer the camera through the lens)
Manual-focus lenses (including all screw-mount lenses) need manual focussing BUT the focus confirmation (autofocus indicator) will light when focus is correct (according to the camera).
You do know that now the Iron Curtain is well and truly down you can get Practicas on evilbay/ internet for about $100 including postage, fully reconditioned from reputable sellers?
Bear in mind that you will get a reduced field of view (but equal depth of focus) from your lens on a Pentax digital or a prosumer Nikon body. Multiply the lens focal length by 1.5 for the 35mm equivialent:
400mm gives 600mm equivalent view
28mm gives 42mm equivalent view
50mm gives 75mm view.
I use a 28mm as my "standard" lens on a digital and wouldn't recommend a zoom with 28-105 unless you normally find yourself swapping 50mm/90mm/150mm on your Practica. If you EVER use wide angle, get a zoom down to 18mm (27 equivalent) minimum.
IMHO. 

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