Many many thanks for the replies.
dpcon - I checked out the 'harsh' articulations you mention just now, and they do indeed add more bite to the string element of the stabs, which is helping a lot. Thank you.
synthetic - I will try and find that Stravinsky score and see how he's orchestrated the stabs. Thank you.
JWL - thanks for all the pointers. I will see if I can program the string section grace notes you mention to try and introduce more movement into the stab. I think that's definitely an element of the sound I'm looking for. I'm not specifically looking for a pop sound - more a 'big-screen' Hollywood climax, which sounds intrinsically classical to my ear, although I acknowledge it may include more than just conventional orchestral elements. That said, your suggestions re. trumpets and saxes are definitely worth checking out.
Can I finally ask if there are specific percussion sounds which might feature in a stab, beyond perhaps timpani and crash? I found something called a 'thunderboard' (?) yesterday, whcih seems to have a nice mid range 'thwack', but perhaps there are other more typical instruments one might use.
Thanks again to all. I feel the ultimate stab draws ever closer ..... [:D]
Jules