Treadmill advice needed

Hi,

I am thinking about buying my first treadmill.  My family and I are on
a very, very tight budget and we are counting every penny so this is a
huge decision for us and I need some help in deciding which one to
pick.

I am 6 foot 3 (189cm) for 252 pounds (115kgs) and I need to walk for
about 30min on a daily basis to loose weight.  The climate where I
live makes outdoor walking impossible most of the year and, besides, I
need to stay at home to watch for the kids.  I do not plan to run on
the treadmill, only walk, initially slowly (I am very much out of
shape), but eventually at a brisk pace to get a good aerobic exercise.

I have been initially tempted to buy the NordicTrack C2155 (
http://tinyurl.com/5amgjq
)

But the newer NordicTrack A2350 looks even better to me (
http://tinyurl.com/5mfsxs
)

My questions to you are:

1) Do NordicTrack treadmills have a good reputation?
2) What do you think of the two models I am considering?
3) Can you think of a better (as in value for the money) deal than
these NordicTrack treadmills?

Many thanks for any pointers!

Mamadu