If you go into driving the Toronado with a mindset of it being just for fun, then you might enjoy it for a bit. Much like the Tank Car, it's a bit silly, hugely impractical, but quite enjoyable - a bit of novelty. But Cr. 1,000,000 is an awful lot for a toy, mind, which you may ultimately get bored of.
I haven't got the NSX, but let me put this way - it costs over 10 times as much as a GT-R Black edition, and I can't imagine it's 10 times better.
If at some point you're loaded with dosh (e.g. after these new seasonals are released) I'd get both, as a case of curiousity and out of a need for completeness, but I wouldn't recommend either if say, you're aiming to make progress in the career mode, or when you only have Cr. 1,100,000.
Hope this helps.