Hi... Newby needing advice in the UK

[TVR Beaver]

Hi Guy’s… a Rolex site virgin here so please be kind 

That said, I’ve been interested in watches for many years but have never owned a Rolex (Boooo I know). But I want to put that to rights!
I’ve spent a lot of time in China over the last few years and have seen a number of copy Rolex GMT II and Submariners and these have prompted me to go on and buy the real thing (who says copy’s don’t work!)
The question is, which one… I’d never go diving in a sub…. Nor would I take the GMT travelling (especially to where I go) although I do think the GMT would be the one to go for.
Whilst travelling through Schiphol I’ve seen the GMT’s for sale for 5208 Euro’s which is a real good price so I may go with that. This is for the last Ceramic faced models, black face and green second time zone hand… Are these as desirable as the others?
Or, I may buy in the UK as I like the old Coke bezel red and black models… but buying second hand scares me to death. I used to deal with a company called Portascape in Switzerland who makes the escapements for Rolex etc. They showed me a Swiss copy once and believe me, you could not tell the difference (I’m and Engineer and have a very keen eye for detail)
So what to do… who best to buy from in the UK second hand… are there any overseas dealers to be trusted at the exchange with the $ is good at the moment…..

Any advice appreciated… 