Resale was a concern Nick. The 430 is starting to look dated now and I was keen to get out before the F450 breaks cover. Like you I prefer the spider as I find I've used the open top variants of my exotics far more than the coupe versions.
The Cali is a lot softer than the 430 and because you sit further back in the wheelbase you don't have that feeling of being connected directly to the front wheels through the steering. It's a more involving car to drive than the Maserati though and I think I'll get a lot of use out of it. Time will tell. Rod Stewart's Cali had arrived at the dealer who is selling my spider but I didn't bother to look at it. It's grigio alloy with crema apparently..... not my favourite colours.