Help buying a bike

Hi guys I'm looking at buying my first dirt bike.

your physical size (both height and weight are important)
5'10 160lb

How physical / aggressive are you ?
Don't know yet

what do you plan to ride- MX/SX tracks, woods, fields with friends or ?????
woods old fire roads

Do you have any riding experience?
Nope

Do you think you will race ?
maybe but if i did i would buy another bike

Are you mechanically inclined and will you be doing your own bike work?
hopefully i will do it myself

Do YOU have a preferance to a brand/ motor choice (2 or 4 stroke)?
no

Do you have a dealer close by your home that you might use and what brand(s) does he carry?
Suzuki Honda Yamaha

How much ($) do you plan to spend on a bike?
max $1500 au

Do you live in California?
no

Your age?
16

anything else that you think would help form an opinion
The place i live has very steep hills some 48%
I ride mountain bikes

Are these bikes any good

Yamaha DT 175 1980's
honda xr250 or 200
yamaha IT175 1980's

A bike has come up for sale near were i live
its a honda xr 250 1993
for $1300
on the ad it said "good condition goes well"
Is it to old?