I think it's worth being patient, you've got plenty of awesome cars to use in the meantime and when the right one appears you can grab it. You know full well if you compromise a UV car will come up the next day!
OR, sell the 458 and get a 675LT Spider. Please.
No Mclaren can rival the 458 sorry, as a fun supercar for the road not much to be honest will rival the 458, staggering performance aside Mclarens do diddly squat for me. I prefer cars that are fun to drive both at legal speeds on the road and insane speeds on the track, as such I find a lot of cars damn right boring on the road once you get pass maybe the cool looks and sounds which some cars offer.
It is why the GT3 RS is somewhat a wild card for me as I know a couple of guys who have GT3 RS along stuff like 458's and 812's amongst some other cars and they personally feel I would potentially find the GT3 RS a little boring on the road compared to the 458 which is such an event whether its been driven at 10mph or 100mph.
However a GT3 RS was a dream, it still is a dream, just the 458 through the spanner in the works, but if I can get into a GT3 RS and keep the 458 it seems worth while exploring that route, end of the day if its not for me they are quite easy to move on, gonna be the case of meet your hero and either be disappointed or love it, having only driven the RS on track, which I loved I am yet to experience an RS on the road, thank fully the gearing on 991.1 GT3 RS is reasonably sensible, not 458 short, but it is also not crazy leggy at around 70mph in 2nd and 100 in 3rd.
Yes I am going to be patient, I am gonna view the low mileage lava orange with the crazy orange interior, it is worth a look, but I intend on holding out for a fair priced UV with around 15-20k miles which should be more in the 140-150k price region, which is where I want to be.
My other option is just wait until got Emira, enjoy that for Summer, sell it end of Summer and then hunt down a GT3 once Winter is upon us again and maybe recession which could result in some good deals hitting the market.