Glad most everything worked out for you. As far as the brake chatter, your best initial option is trying to get a true rotor. If I remember correctly, your 2008 rotor isn't nearly as costly as my 2006. Get your new rotor and throw a dial indicator on it before driving it to make sure it is true. At least that way you may be able to return the rotor (unused) if it isn't true. If all else fails I can try and help you on the 4 wheel brakes.....
-2011 Polaris RZR-4 800 (SOLD)
-1999 Polaris Sportsman 500 ATV
-2006 AC Prowler 650XT (SOLD)-- updated bevel gears, updated oil pump driven gear, 4 wheel disc brakes, line lock E-brake, Papa Slap clutch, Xentec HID's, Dynatek CDI, Warn skid plates, Intellitronix gauges, 2010 intake/cvt duct work and dust shield, RZR seats, Bestop folding windshield, full cab kit, rear cage and rear seats (4 seater)