Spread vs. Volatility (What pairs come out on top?)

I am wondering if there is a general equation as to what the best pairs to trade are when factoring in spread vs. volatility? This will vary upon the session being traded, the numbers I am looking at are here: http://www.goforex.net/forex-trading-times.pdf

I am interested in the NY session's volatility.

Then, I will use the recent Oanda spreads listed here: http://www.fxintel.com/live/

EUR/USD: 78; 1.4 = 55.714.
USD/JPY: 69; 1.2 = 57.5
GBP/USD: 94; 2.6 = 36.154.
USD/CHF: 107; 3.4 = 31.471.
AUD/USD: 47; 1.9 = 24.737.
USD/CAD: 84; 2.6 = 32.308.

EUR/CHF: 49; 5.1 = 9.608.
EUR/GBP: 34; 1.7 = 20
GBP/JPY: 119; 3.5 = 34.
GBP/CHF: 129; 5.9 = 21.864.
AUD/JPY: 56; 2.3 = 24.348.

I think from above the higher number the better, so this means the USD/JPY, EUR/USD, GBP/USD, GBP/JPY are the four best considering volatility vs. spread.

If anyone has more recent volatility numbers per day per session let me know, thanks.

P.S. I should mention the margin requirement may have something to do with one's decision as well, where I note USD/JPY, USD/CHF, and AUD/USD have low margin.

P.S.S. I hate trading USD/JPY lol, it seems the volatility isn't there no matter what the numbers say.

Hmm, volatility and trading range can't be equated like that.

And the answer to your question is related more to trading strategy than volatility or trading range.

For example, if your strategy has a risk tolerance (stop loss) of 30 pips, spread is less important that if you can tolerate no more than 7 pips.

I haven't checked the date range of the data, but intervention may be skewing the figures for yen and chf.