If you are seriously looking at semi-hollows, definitely give the Guild Starfire IV a look. I own one (picutured left) and the build and attention to detail is very hi-quality. The SF-IV can handle most styles... except hardcore metal and the such. Also, they tend to be expensive retail, but their re-sale value isn't as strong as the Gibson 335... therefore it's easy to find one for about half the cost of a Gibson used. I found mine used and paid just about a grand for it.
The Guild stock humbuckers are regarded as very good for their sound. I'm actually in the process of pulling them out and dropping in some Duncans to give it a heavier sound.
Just a note about electronics in semi-hollows, some actually have a cut-away in the solid-block below the bridge pup. You can pass your pots, etc. through there. Otherwise, you will have to get the pots through your f-holes (a little painter's tape in the right places will help your f-holes from getting scratched).
Good luck.
TS