in my opinion, your height and weight could make a mod difficult, a stock would be much easier for you to ride. i love my stock soooo much, it feels really tight and flicky, its my first bike so if anyone says anything about stocks being hard to learn on, ignore it, im doing great! most mods, to me, feel very slack and squishy, i hate it, they're so small too! look around in the for sale section, you could get pretty far on £250, i think there is an 03 Koxx Levelboss for about that in there, it would be a great bike for the money. good luck! if you need any help, dont hesitate to contact me, ill try my best to help you! my e-mail adress is in my signature VVVVVV matt