Ignore that last one then! Manchester, oop north, UK. You've mentioned a few bands above that I'm particularly keen on, would you care to mention any others? It's fairly hard to come across some of the less well known post-rockers, so i would love to hear your favourites (or any genre for that matter)
If it's math-rock/post rock you want to explore, then I highly recommend 65daysofstatic, Rodan (very similar to Slint) June Of 44, Shellac, Chavez and Drive Like Jehu. Some post rock: Godspeed You! Black Emperor, The Evpatoria Report (amazing Swiss post rock, not well known but certainly worth a listen) Sigur Ros (very well know, but still very good), Do Make Say Think, Pelican, Mono.
other favourites include: Pavement (Crooked Rain, Crooked Rain is simply amazing), Built To Spill, Sonic Youth (Daydream Nation is mandatory listening), Dinosaur Jr. and a million others. I could go on forever and ever, but these are pretty much essentials if you ask me.
Marantz CD17 MkII > Marantz PM17 > B&W DM601 S3