best treadmill for marathon-triathlon training?

[Ian]

Hello

I am in the market for a good quality treadmill that my wife and I will use
for marathon/triathon training during the winters and want to spend
4000-6000 USD. It should also have a good waranty.

I weigh 200 pounds, am 6"2 and have a big stride.

I have looked at Life Fitness/Precor/True/Landice.

I was hoping that you could give me some advice on these and other types and
prices out there.

Thanks, much appreciated!

Ian