I'm going to have to replace my furnace and hot water heater next year
so I'm exploring some options. One of the biggest things I have to
consider is up front cost and on going cost. Currently I have a forced
air gas furnace and gas water heater.

I'm curious to know if replacing the furance with a radiant floor
heating setup would be cheaper. I'm bascially looking for some
ballpark, rough estimate answers that would tell me which of the
following would be cheaper to install:

Option 1:

DIY radian heating where I run the pipes and do all other plumbing, but
have a pro install the gas water heater that would heat both the house
water and the floors. DIY installation of a blower unit for the air
conditioner. (since there's no more furnace blower)

Option 2:

Have a pro install a new forced air gas furnace and a gas water heater.
Connect the air conditioner to the new furnance blower.

I know prices vary depending on which modles, etc. I choose and provide
different efficiency levels, but let's assume a mid
quality/price/efficiency point for both systems. If the comments I
receive point to the DIY radian floor heating installation being way
cheaper I would do more research. If both options are pretty much on
par, then I would probably just have a new furnace installed since I
don't have to do as much work.

Btw, I'm located in Ontario, Canada.

Thanks for all the comments,
Harry