Let me know if you find something that works.
I bet spent at least an hour between downloading (Hillmap.com - MyTopo) and stitching together (Print Screen button to MS Paint to PS CS5) a 7220x8656 (62MP!) topo of a section of Seki NP for an upcoming trip.
I've streamlined the process and think it wouldn't take as long if I had wanted to do it again, but it would be much slower on the low res screens that most people use. I used a 27" 2560x1440, so the base tiles were about 2300x1200 (pretty sure I stitched together at least 24 such tiles to make my map). The end result is pretty awesome between the level of detail and scale (it covers roughly 17mi x 14mi), but it sure would be great if there was a faster/better way.
If anyone wants a copy, I could probably upload it somewhere (be warned, it's a pretty big file - 65mb JPEG) - the four corners are Case Mountain (SW), Florence Peak (SE), Josephine Lake (NE), there isn't really a good landmark in the NW corner - Jennie Lake, maybe? The map stretches a little bit further to the west.
Edit: Peter's link is pretty great - The individual maps appear to have the same level of detail, but are a bit higher resolution. MyTopo is based on the same USGS maps, so not really a huge surprise, although I do miss MyTopo's shading. Also, you'd still need to stitch the maps together, but downloading a file is more convenient than the Print Screen button.