I made up my own size for it, but it's just a smidge smaller than full screen. The only reason I keep it that way is so I can see what I have under it without alt-tabbing and what not. ^^
I play in the windowed up screen just to be able to alt-tab when I'm regenning, mainly when I'm on my sin, since takes so long to regen to full sweatdrop
windowed, which makes everything awfully boxed in (the menu windows take up a lot of space) but i'm always doing too many things at once to play at fullscreen.
Since my dad doesn't want me to play RO, I gotta alt tab quick enough so he can't catch me so I play window, plus my computer is freakin' 800x600 so the 800x600 window mode takes up the whole screen anyway.