I don't use SizeUp, so this solution won't apply to that particular utility, but I do use a window manager. Moom, which I use, is activated by a single keyboard shortcut. Once activated, Moom captures shortcuts that might otherwise be handled by other applications. This makes all window resize actions a two step process, but I find that's a worthwhile trade-off for avoiding shortcut collisions.
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A question for those using sizeup, how do you make sure the hotkeys you create don't conflict with hotkeys in your apps?
I don't use SizeUp, so this solution won't apply to that particular utility, but I do use a window manager. Moom, which I use, is activated by a single keyboard shortcut. Once activated, Moom captures shortcuts that might otherwise be handled by other applications. This makes all window resize actions a two step process, but I find that's a worthwhile trade-off for avoiding shortcut collisions.
you might want to look into Keycue http://www.ergonis.com/products/keycue/ or CheatSheet http://www.cheatsheetapp.com/CheatSheet/ (only works in the current application)