you need to ditch Scrypt it's ASIC only territory now.
X11 X13 X15 NIST5 SCRYPT-N Keccak SCRYPT-Jane all pretty much the same profitability wise.
X11 is probably the most "Mainstream" and it's true right now Cryptonight is the most profitable...but it will probably be even with all the rest very soon.
GPU mining profitability is very slim currently and thats the simple truth.
In regards to Monero (Cryptonight) hashrates the Google doc does have another tab at the bottom for GPU's however it's not very up to date.
expect 400h/s-500h/s for a 280X and scale to your equivalent hardware.
I personally am mining monero right now but i don't really expect that to last that much longer

... i am just trying to hold on till winter and also hoping the current trend is going to reverse.