for 350 this moto is pretty decent
Save Up to 60% Off Road Bikes - Motobecane Mirage
I agree that you should sell the walmart bike on craigs list for what ever you can get and use it towards your purchase.
I would recommend against buying the goofy nano.
final thoughts save up alittle more cash
this mirage is only $400
Save Up to 60% Off Road Bikes - Motobecane Mirage S
this one $500
Save Up to 60% Off Road Bikes - Motobecane Mirage S
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2010 Kestrel RT900SL, 800k carbon, chorus/record, speedplay, zonda
2000 litespeed Unicoi Ti, XTR,XT, Campy crank, time atac, carbon forks