Overseas 4520V Black dial (new) vs Overseas 4500V Silver/Black dial (pre-owned). Any thoughts and feedback appreciated!

Looking at the Overseas 4520V Black Dial as a one-and-done to pair with my 2014 black dial/rose gold Patrimony. AD says 50% deposit can secure an allocation with a 2-3 month wait to receive it. It would take some work but I could get a silver or black dial 4500v pre-owned. Would save some cash and be able to look at the silver dial option. What are your thoughts on black vs silver dial? And going through the hassle of finding a solid pre-owned vs just dealing with the $5k plus extra in cost. AD was fantastic (what a breath of fresh air vs trying to get an Explorer II from Rolex) but not sure I have the budget to buy more Vacheron, and benefit from that relationship. But there is only one AD in my city, so not bad to be on good terms.