I know you're trying to get as many bikes as you can but taking two Captains and two Command Squads isn't going to help. You're paying a second "Biker Captain" tax just to get another Command Squad. Combined those units are costing 1060 points over half your army!
What you have isn't really a true bike list. It's got some bikes and then some Tacticals just pissing in the wind because they have no transport as the Land Raider isn't a affective fire bunker for them.
If you want a true biker list try this:
Captain - relic blade, storm shield, aux grenade launcher & bike
Command Squad - 4 x plasma guns & bikes
8 x Space Marine Bikers + Attack Bike - 2 x meltaguns - Attack Bike w/ multi melta - Sgt w/ power fist
8 x Space Marine Bikers + Attack Bike - 2 x meltaguns - Attack Bike w/ multi melta - Sgt w/ power fist
8 x Space Marine Bikers + Attack Bike - 2 x meltaguns - Attack Bike w/ multi melta - Sgt w/ power fist
Land Speeder - typhoon missile launcher
Land Speeder - typhoon missile launcher
Land Speeder - typhoon missile launcher
5 x Devastators - 4 x missile launchers
5 x Devastators - 4 x missile launchers
Check points because I haven't. You've now got a single Captain who is giving a benefit and not costing points just to get something. You've got a Command Squad who can dish out plasma death and has feel no pain just incase. You have a lot more Biker troops with meltas and power fist for smashing stuff. Typhoons and
Devs add missile launchers, the only true vehicles in this list is the Typhoons minimising the opponents anti tank making it almost worthless.
Oh I wrote this list sometime ago so I am not sure how valid it is but it has Dreadnoughts and Bikers which is something different:
http://www.imperiusdominatus.com/2010/02/army-lists-dreadnoughts-bikes-with-hint.html