Please help me pic which dirtbike!!?

I need help chosen which dirt bike is ryte for me ..I'm 15 125 pound and about 5'3 and I am going to trade my 94 ford explorer for one of these dirt bikes but I don't know which one to get please help me!!! here is the link to the rm125... a href="http://atlanta.craigslist.org/nat/mcy/2439802418.html." rel="nofollow"http://atlanta.craigslist.org/nat/mcy/24…/a and this is the klx125 .. a href="http://atlanta.craigslist.org/atl/mcy/2470537189.html." rel="nofollow"http://atlanta.craigslist.org/atl/mcy/24…/a please help me pick witch is ryte for me