replacing 57 year old cast iron boiler with???

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: Hello all, : I live in Memphis,Tn and have a house built in 1953 with its original boiler (prod date 1949) a 270,000 btu US Raidiator CO natural gas boiler with a high-head B&G pump. I have baseboard radiators throughout with mono-valves on them. The whole house is plumbed in inch and a half steel pipe (black?) , one zone, and the system still works well, but I figured with modern technology it wouldn't hurt to upgrade the boiler. : Physically my boiler is huge, like refrigerator size. There aren't any contractors here who do residential radiant, we live in the land of forced air. The nearest dealer for such, is about 230 miles to the north, as its' super uncommon to have radiant heat in Memphis. : I have another house with a Takagi in place and I really like it, but for this house, my idea was just to replace the boiler, not add zones or re-invent the system. I wanted to leave the existing expansion tank and leave the aquastat and b&g pump alone. : I thought about using takagi tk3 tied to a buffer tank (old hot water tank) to handle the water volume (9-12 gal per minute I think). I also thought of a peerless pinnacle 199, or maybe a munchkin . : Any thoughts? : Kind regards, : Herbert Phillips : Memphis,TN