I'm still on my quest to find powerful hits, so I just wanted to update people on my progress. The best 'power hit' I've come up with uses Gold and a little bit from the Roland Orchestral sound set (LCDX-04). Not *just* a string hit since it uses some french horn as well, but I think it sounds like mostly strings, or at least, is closest to the sound I want.
Again, a riff from the Metal Gear Solid 2 main theme.
Here's another patch, for higher string hits. This one uses the close (as opposed to far) marcato and quick u/d patches from Gold, the Roland marcato strings, and the "Cadenza" marcato strings. It uses GlaceVerb.
This riff is from a rearrangement I did, based on a song from the SNES game "Chrono Trigger".