One more thing about the cascode. Transistor Q1 is dissipating 170mW with the values shown. It may get a little warm - you have to watch that. You can put a "helper" resistor between Q1 collector and Q2 base. The value is completely immaterial since the current is set by the R2 emitter resistor, so something in the order of 100k will do. This will then dissipate 100mW and take the burden off the transistor. But as far as the circuit operation is concerned, it's completely unnecessary.
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