Well that's a game output and while interesting, it shows a series of your major mods erroring one after the other. But it doesn't really show why.
Do you have an actual crash report? If not, go to your MC launcher and copy paste launcher log output as well (after you stall, not before), and also go into your mod folder and select all files, copy and paste here (should list all the file names).
Post the new report after you assigned it more memory. Cause now you may have new issues showing. Either crash report or launcher log+game output from the launcher.
Hmm still multiple cascade failure of major mods and same error. Try changing -Xmn256M and adding -XX:MaxPermSize=512M in your arguments.
If that doesn't work you're stuck doing a binary search. Save your world first, then take out half the mods. Check for crash. If yes, take out half of that half and check again, each time taking out the half that isn't crashing until you narrow down what it is. Or try and get an actual crash report.
http://pastebin.com/qBnz2NyQ
Do you have an actual crash report? If not, go to your MC launcher and copy paste launcher log output as well (after you stall, not before), and also go into your mod folder and select all files, copy and paste here (should list all the file names).
The problem is that Minecraft won't load. Whenever I try to close it, it prompts me with a crash report.
(EDIT: Something maybe going screwy whenever I try to copy-paste my mods.)
http://hopper.minecraft.net/help/exit-code/code-805306369/
seems to suggest memory could be an issue. You do have a lot of big mods but you gave your game only 1G. Increase that to 2 or 3Gb and try again.
http://pastebin.com/x552Zp8D
If that doesn't work you're stuck doing a binary search. Save your world first, then take out half the mods. Check for crash. If yes, take out half of that half and check again, each time taking out the half that isn't crashing until you narrow down what it is. Or try and get an actual crash report.