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@Smallfurry
You need to go by the effective top tube length. On the langster its 548mm. This points to the 55cm Rush at 551mm.
But the rush has a 1deg steeper seat tube. This is going to mean you need to push your seat back to get the same position over the pedals. So the 53cm Rush will probably be the best fit.
Toi be certain you can punch the numbers into BikeCad, and calculate the 'reach'. This will be your best guide.