You need to stick to proven cross geo,Kinesis,Ritchey (from scott) as well as the obvious ridleys,Depends on your price range,but people buying no name frames from china have big issues with handling due to design,Ive raced cross since a very young age and getting right fit on the bike (not road bike or mtb fit) is really more key than material.Take LS for an example who rides the same frames year on year because they are perfect fit for a cross racer of his size.Ive declinded sponsors bikes for poor fit and it makes a huge difference,Charge and planet x arent race bikes…hope that helps