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[hpowers]

my run is 185', looking for a new pump, wilo pumps suck

[LittleJohn]

Generally in my neck of the woods its Green vs Red (Taco vs Grundfos), with regards to the BEST I think the answer is the one that works and can be easily bought and replaced if needed.  I woudl check with your local supply house or radiant installer, they woudl have an idea.

I personally run Grundfos, mainly because with a non-pressurized boiler its highly recommended to use a Stainless Steel or bronze pump and difference in $$$ between a smart (GRundfos Alpha) and a 3 speed pump (like a 15-58) is very minimal.  Also I am pretty sure that I was abel to write off a portion of the valves for taxes because the Alphas are ECM controlled and considered energy saving.

[Sprinter]

Wilco doesn't have a popular rep here. It's all taco,grundfos and B&G.  How old is the circ you have? I would go SS or bronze either way. Proper circ flow is important, as this is one of the main problems I come across.
An easy way to see if you current circ is undersized or oversized is to measure the amp draw. If it is more than the spec or very close to spec rating , it is a wrong application.
For example a typical 007 will draw .26-.33 amps when operating in the middle or lower portion of its head rating. But it will max out @.7 or .8 when it's heavily loaded, leading to a short life. Runs hotter than normal also.

[victor6deep]

Armstrong E9 will eat them all up.

[RSI]

Bronze or stainless is not needed if you are properly treating the water.

I am assuming you have 1" pex. If so, you will probably need something like a Grundfos 26-99 or Taco 0011 size. From  what I have seen, the Taco can't tolerate air in the water as good as Grundfos so if often get air in your system I would avoid Taco. Another advantage of the Grundfos UPS-26-99 is that it is 3 speed and medium might be all you need on your system. (26-96 is probably really close to what you actually need but they aren't really much cheaper and you can use the lower speed on the 26-99 to be equivalent)

I personally like dry rotor pumps. The B&G PL36 is the best value for the cost. The Armstrong E9 supposedly uses less power but I never tested it. Both of these may be slightly too large for what you need but probably fine.

[mlappin]

Since it's been mentioned, how good are the Armstrongs compared to lets say B&G or Grundfos?

[LittleJohn]

Armstrong E9 will eat them all up.

...no lie, looked at pump curve, 40' head or 40gpm; is this right!?!

I would start to worry about over-pumping with that bad boy

[Sloppy_Snood]

Since it's been mentioned, how good are the Armstrongs compared to lets say B&G or Grundfos?

Is Armstrong pumps still in business? 

[userdk]

Grunfos or Badger tend to hold up better than Taco