buy the 17" then
The 15" really should have a wsxga+ (1680x1050) option as does the 17" w/ its wuxga option.
I came from an Asus 15" w/ wsxga+. I miss the resolution dearly. The only saving grace this time around is I'll be hooking up my MBP to an incoming 23" ACD which is pretty much a must for me when working on big projects all day long at home (software dev here). The old Asus squeaked by, just barely, for 3 years all by itself. I move around too much for a 17".