Hi 1991Syclone,
If you're very happy with NN1 you will be extremely gratified with NN3 MKII. Although you still will not be able to shoot the zenith with this lens - to do this you would need NN5L, or a different lens.
We also have a trade-in program for folks using older equipment:
http://nodalninja.com/trade_in.html
BUT - you might want to try eBay - NN's have incredible resale value. We can even post it for you on our website under the used equipment page. If you want to do this touch bases with me - bill[at]nodalninja[dot]com.
Thanks
Bill