F430 Spyder - Winter price drops?

[AMDB9]

I am pretty much ready to pull the trigger on one of these. I will be buying from a main dealer for peace of mind and at the moment they start at the £80k mark for early cars - 55reg cars are within this range as are higher mileage 2007 and 2008 cars. I'll be away most of August and when back we hit Autumn so Im tempted to hold back until Winter kicks in to see how prices are affected. DO main dealers prices drop significantly over the winter months or do these things hold their values well due to being rare cars?

Any insight would be appreciated. Cheers