Which up-datable unit ?

Hi All,

Its my first post so please be gentle

I am after your opinions as to which would be the best unit to purchase.

I currently have a Start 20 with European maps which are a few years old, after reading through the site its apparent there is no unofficial way to update this to to the NC??

I found a thread dated 2011 by Downunder35m , that says "A refurbished Go520/530/720/730 is still the best way to go." Does this still stand? If so what about the 930? Is it a case that the differences of the 20's to 30's are just software and 520/720/920 can all be upgraded to the functionalities of the 530/730/930, or are there other differences such as battery, accuracy etc?

If the above models are still the way to go, as I will be buying second hand, what if the NC has been updated, can it be downgraded or is it imperative that it is on a pre NC10 version to work?

I have the RDS lead for my start 20, will this work with your recommendation?

Anything else I've missed????

I look forward to your knowledge

Thanks