What is the lowest limit with sophisticated strategy?

[shmoe]

I've been playing poker and studying poker (Sklansky/Brunson/wpt etc.) for the last year. This is my question: I want to make a move at the casino but if I play too low a limit and the play is too wretched and I won't beat it. But if I sit, say... 40-80, I stand a chance of getting blown out of the water. Is 10-20 a good limit to start playing? Any advice?