Hi, M.G.
Strings and horns, can't beat 'em.
One of my favourites is the "Storm" Prelude from Peter Grimes by Benjamin Britten: high slow strings with sustained brass chords in the low register, all building to a massive climax. Wait a minute, I've got it around here somewhere.
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Britten's Storm Prelude from Peter Grimes
BRIT33A1.MID (160.5 k)</td></tr></table></center>
Back to your piece: Your violins will shriek over the figure at bar 166 (comes in earlier, too).
I remember a Stravinky-ism: "'But, Maestro, the horn can't play possibly that note!' 'Yes, but think of the look on his face when he tries.'"
Some contra-bassoon on the walking bass line might be interesting, too.
David