Get the Barbie bike it only cost 35 bucks. MLP stuff is way over-priced.
These guys know custom bikes, but they got pretty far on Walmart 150 buck bikes. Slicks would help if you are going on the road. Also cruise a lot of bike shops leaning as much as you can about bikes so you can pick a "walmart" bike with solid simple features.
http://www.rayjardine.com/adventures...03-iua-2.shtml