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I'd feel your radiator after it got hot. Place your hand from top to bottom along the cooling fins (with engine off). If the bottom of the radiator is cooler at the bottom than the top, you can assume the radiator is getting stopped up. If there are no leaks, and the radiator is in good shape, send it to a radiator shop to have the tanks pulled off, everything boiled, and rod the cores.
If there is a constant temp from top to bottom, and you replaced the thermostat, you may have a problem with a (or both of), the heads. If the heads are suspect, take your radiator cap off (when cool), start the engine, and see if you see bubbles in the fluid. If so, the combustion of the engine is getting in to the water jacket (usually a bad head gasket from the inside). Not all head gasket breaks will cause white smoke from the exhaust.
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