for your basic cookie cutter CB build: 15 in speed to 25, 2 in agility to 12. train speed/agility until you can softcap speed. switch training to agility/vision and bring speed to 68 cap. when speed hits 68, switch training to vision/jumping and bring agility yo 68. when agility hits 68, switch training to jumping/strength or jumping/stamina while you bring vision up to 68 or 74. and that should take you to the low or mid 30s... i think. ha, i really dont feel like doing the math or running it through the VPB, but thats the just if it and should keep you busy for a while.
take a look at my retired lvl 63 CB if you want something decent to build towards. he is by no means perfect, but id say he is far more good than bad.
http://goallineblitz.com/game/player.pl?player_id=365592