Maybe in watch land - and perhaps I'm not totally precise here - it's like trading in a Zeitwerk, a Sapphire Datograph, adding cash, and getting an RM-11-03? I think the asking price for the Pista is way too much (and the trade in too little!). Your dealer friend could do better
If you want a silly but reasonable Ferrari consideration I've seen 812 Superfasts for reasonable prices, and that NA V12 is to die for and maybe in a last line of NA V12s...throw in the Ferrari authorised warranty you get free maintenance, bumper to bumper, and a lot of fun and perhaps a little but more GT for long hauls. Just make sure to warm up those tyres before flooring it!
Cheers and good luck!
Peter