I also like the resolution independence and use Illustrator for logos and such - but with a map like mountain realms its just about all textures - and as such, you become dependent upon resolution. If I'd made it in Illustrator and added texture there then resizing it would still mess the the textures as they would needed to be scaled up. If that shouldn't be a problem, then I'll have to work with HUGE textures as they should be prepared for poster size (if needed), but they should still "fit" when scaled down, so the look of them don't screw up the map - think trees in perfect size for the map, should still be in perfect size no matter if the map is printed on a business card or on a poster