Miles mean fuck all to be fair, as esp after that number so much has likely been replaced over the years. Very rarely does condition reflect the miles a cars done, it's more how it's been maintained.
And wouldn't be arsed compression testing it, bearings normally go before rings on a SR20.
More to the point, it's rust and shit that's the expensive fix on a 200SX, not a new engine.
If the price is right for the condition, buy it.