The Korg PS 60 has lots of vintage keyboard sounds and is half the price of a Nord.
http://www.korg.com/ps60
On the organ tab, it has lots of hammond settings, a "vox classic" setting and "60's registars" which sounds like Johnny and the Hurricanes. You can add vibrato to any setting and change rotary speeds. There are 52 organ presets available, so there's a good bit of variety.
The Electric Piano has a "Old E. Piano" setting that nails the dark Wurlitzer tone.
In the string section, there are some decent mellotron like settings.
Plus you can layer and split the settings. I use some left hand piano/right hand organ on a few songs. Most Nord models cannot have piano and organ at the same time.