help: best data bank for back testing?

Quote from Nana Trader:

Tickdata don't have quote data, they have traded price for tickdata only. I mean like this

http://www.regisdata.co.uk/sampledata.htm

I have two emails from tickdata.com confirming that they don't have it.

fair enough - when you said tick data, i assume you meant actual trades. if you'd said quote data, i'd have understood.

well, fair to say, depending on what you want, tickdata.com is a good, if expensive, provider
 
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