Most of the pros on this forum recommend the Bradford White or the Rheem. The Smith does not rate very highly among them, but the Whirlpool definitely is terrible. Galvanized pipes went out with the buggy whips and were hauls off by Reo trucks. You might want to look into repipeing with copper. you could also consider Pex. I assume natural gas is not available, but if it is, this would be a good time to convert. Gas is much more efficient and economical that electricity. Propane is good, but more expensive. I'd leave those cast iron drain alone.