Go for the pump with the highest head/pressure, check out the Pressure~Curves on the manufactorers sites, I've heard the Via's are'nt as well made and are noisey, compared to the 1250. I have a 1250 but would'nt buy the same again if I had another chance...
I'd buy an Iwaki MD20RZT myself if I had the money...
The different configurations usualy yeild no (measurable) temp difference :shrug: , go with whatever is easiest to mount in your case, I'd replace your BiX for a car HC or a D~Tec core with shroud...
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