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Now lets see one in a shuttle case5870 in an Antec 300.
I'm in the same boat, looking at the getting a 5870 shortly but like a lot of cases, me antec 300 is just too short, BUT, with careful use of a dremel I reckon the appropriate material can be removed properly and might not effect then resale value, some ppl might even consider the modification to be a benefit, afterall, it makes the case the more versatile (for bigger cards) and I reckon you'd only lose the space for one h/d (gonna have to check that one though).
why wont it fit? It hit the HDD cage or what?
Inside my PC-A16 (crappy mobile phone pic)...
I had already moved the HDD cage up for my 8800 which is about the same length. Plenty of room after that.