The 250 is the better bike for you IMNSHO 
The weight difference is only 20 lb and you are lots tall enough. Seat height on earlier Ninjas is 29.3" while the CBR is an inch taller. Current Ninaj is the same.
Superb ride for you for years. ......as with many but the diehards you will outgrow the 125 and struggle in traffic whereas with your weight you could go anywhere for many years on the 250.
It's a great mix of docile at low sped with unending top end.
The 13 hp on the CBR requires you to constantly be shfiting gears - and I mean constantly while the 250 has enough low end with your weight to be far more forgiving.
I'd surely be considering a used Ninja - lower seat - basically they are all the same bike for years - Kawi owns the category - and tons of support for them.
Here's a good deal
http://toronto.en.craigslist.ca/tor/mcy/2461208679.html
and it's even been lowered and barely broken in.....
$3200 with 1300 km...and late model .....right on the money for your rider profile and much fun.
You are on the correct track looking for an experienced rider to help you out but caveat emptor with the dealers..most are not your friend.
For what's it's worth - 43 years riding experience and my son owned a 250 Ninja.

The weight difference is only 20 lb and you are lots tall enough. Seat height on earlier Ninjas is 29.3" while the CBR is an inch taller. Current Ninaj is the same.
Superb ride for you for years. ......as with many but the diehards you will outgrow the 125 and struggle in traffic whereas with your weight you could go anywhere for many years on the 250.
It's a great mix of docile at low sped with unending top end.
The 13 hp on the CBR requires you to constantly be shfiting gears - and I mean constantly while the 250 has enough low end with your weight to be far more forgiving.
I'd surely be considering a used Ninja - lower seat - basically they are all the same bike for years - Kawi owns the category - and tons of support for them.
Here's a good deal
http://toronto.en.craigslist.ca/tor/mcy/2461208679.html
and it's even been lowered and barely broken in.....

$3200 with 1300 km...and late model .....right on the money for your rider profile and much fun.
You are on the correct track looking for an experienced rider to help you out but caveat emptor with the dealers..most are not your friend.
For what's it's worth - 43 years riding experience and my son owned a 250 Ninja.
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