I'm happy to give you some insight as I have owned / currently own some very similar cars to you. In the past, I have owned both a Pre-LP Gallardo Superleggera and a LP570 Performante Spyder. Looking at these two, I actually preferred the sound and performance of the Pre-LP Super G. I think the look of the LP570 was more aggressive and beautiful, but if they were both sitting in front of me and I could choose only one, I would choose the 2008 Super G. Now, I can understand what you are describing when you talk about the technology of the McLaren, as I currently have a 675LT Spyder. In my opinion, since you already have the tech of the 570S, I would tell you to keep the Pre-LP. If you want to have a Spyder, just keep the one you currently have. If you want something a little more aggressive and would do a second coupe, the Pre-LP Superleggera is a great choice and one you would not be disappointed with. Lastly, the Huracan is a drastic difference and you would certainly get the technological upgrades and a much more comparable car to your McLaren. Personally, I'm not a big fan of the Huracan. Have you considered a Murcielago? That's the route I ended up going down as I have the technology on my other vehicles, but I wanted the old-school raw feeling of the true Lamborghini.