Colour and supplier conundrum

So here's the story. I bought a Rosso Maranello Speciale this year, my first new Ferrari though I have had four others used, one of those also supplied by my local Ferrari dealer.

Having thoroughly enjoyed the experience, where the dealer worked particularly hard and did a great job, (actually my best ever retail experience) I have discussed a plan with my dealer, who is excellent, to purchase a number of new cars from him over the next few years, in order to be supplied some of the rarer vehicles coming in the future (I am particularly taken with the F12 TDF which for those with access to one looks simply awesome, therefore I suspect the next gen TDF will be one I would like to be supplied with).

Any new cars I buy en route will be supplied back through my dealer and I will play the game straight. (Planned additional new cars will be 488 spider, new generation FF, maybe one other, leading into 488 Aperta or equivalent and F12 TDF new generation or equivalent).

The conundrum: I have a 12C (which I have loved by the way) and will sell as part of the 'plan' in favour of a used FF. So, my dealer has a Rosso Maranello (a colour actually launched with the FF) car, 2012 with 20k miles on, importantly it includes driver LEDs. It has the cuoio semi aniline interior and I have not seen it yet. However, his offer on my 12C was a fair way less than my McLaren dealer, who coincidentally also had a used FF in stock.

This car is a TDF/beige with diamond stitch but no driver LEDs, one year newer and only 7k miles. I have seen this car and it looks very good. It is, of course more expensive but with the extra for the 12C plus I think he is about to come down some more on the FF means that price to change might only be about around £5k/$8k different. By my reckoning that makes the deal about £10k/$15k better, with the Ferrari dealer having already moved £5k and seemingly unable to get closer.

My Ferrari dealer, (I know the salesman well and like him) and who would obviously like my business has, in his words 'cheekily suggested' that if I didn't go for the TDF car and chose their car, even though he cannot get to the same valuation on my 12C it would be much appreciated and in the (long) long run I wouldn't be left out of pocket. We clearly both know that there is a limit to this and I believe they see the point that the issue is the McLaren valuation, where they are competing with my McLaren dealer, so no hard feelings. Maybe?

Anyhow, my reasoning for a used FF is that I will keep it until ordering a new one, which I already know will be some cost to me so I want to 'check out' the FF experience first, without losing too much money, therefore relative depreciation of the two cars over the next 18 months is a factor. I have a regular use for the full size four seats and feel that the more sombre TDF may well suit my use better, on the other hand I think RM is a particularly beautiful colour (though I do already have my Speciale in that colour). Finally, the RM car has the driver LEDs which would be a major deal for me in a mid engined car but I'm not sure about how I would feel about lacking it in an FF? I also have a feeling that to buy a car on a 'weaker' deal might be an opportunity to show some good faith (and vice versa). I know that dealers in the U.S. can be a bit more difficult but mostly in the UK they are ok and my one has been very very good so showing 'good faith' has some value in this case I believe.

Any thoughts from those who have built up a long standing relationship with their dealer and have access to cars like the F12 TDF or those who own an FF?