Hello and
I too have been researching incubators and specifically the Hova bators. I actually made an excel spread sheet to compare the differences between them all (including prices and shipping) because it is difficult to tell just from the description and they all practically look the same! I'm not sure how to post that on here but if you want a copy, PM me and I will send the file to you.
The main difference with the 1602n compared to the others is that it doesn't have a fan. From the research I have done, it sounds like it is best to have a fan to help stabilize the temperatures inside the incubator. If you are handy or have someone that could help you, you could add a fan to the unit.
Heidi