im lookin at the ninja 250 but a lot of my friends are telling me imma get bored with it quickly..i know how to ride a dirt bike and quad but ive never ridden a street bike b4..im 5' 8 160 lbs. any suggestions?

Trust me on this; the 250 is too small. l used to own a Honda / Suzuki / Kawasaki store & now build bikes on my own. The ideal first bike is an older (do not buy new) Suzuki GS-500, Kawasaki Ninja 500 or 600 (the five is lacking in alot of key areas) or the Katana 600 (or even the Katana 750, since the power plant is under-powered by today is standards but still fast enough to really scare a newbie). These bikes can be purchesed cheaply second-hand, they will grow with u as u improve (you wo not outgrow them in six months) & u wo not care if u drop it a few times. Once u have been riding a year or two, look into getting th bike u really want (you will know what it is by then). Until then, ride the cheapest 600 u can lay ur hands on & learn all u can. Take the motorcycle safety course in ur city; it will save ur life.

Keep the rubber side down & enjoy the ride!

u should look into a 500 or 600, its only as fast as u wanna make it. just trying to help.

Start with the 250. You will get beaten of at first but you will become a better rider. When you can ride the 250 fully (meaning you can hurt it without it hurting you) then go bigger. By that time you will be a better rider than those who started on the big bikes.
You have got some experience so perhaps you could start on a bigger bike but in saying that what size was the dirt bike you rode. l will bet it was not any bigger than a 250 if it even was that big.

l would go with either a JR50 or PW50. Both are available with training wheels.