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For some older stuff that's leaning towards the harsher end of the spectrum try The Telescopes, Loop, Lilys (In the Presence of Nothing), Swirlies, Flying Saucer Attack (self-titled), The Ecstasy of Saint Theresa (early stuff), Skywave (very harsh!), Band of Susans and Henry's Dress (leaning more towards noise-pop).
All great suggestions - Band of Susans are seriously underrated!
I saw The Telescopes live recently and it was pretty much just a noise gig - not much in the way of songs at all, just an all out feedback assault. It was good! Their first album is a good one for harsher shoegaze.
I'd suggest Bailter Space, WhateverDude.
They're more noise rock than shoegaze but they cross the line on occasion - like on this one.
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