Hi! Just running off your models list I come to this:
++ Battalion Detachment +3CP (Imperium - Space Marines) [47 PL, 865pts] ++
+ HQ +
Captain in Terminator Armor [7 PL, 129pts]: Chainfist, Storm bolter
Captain in Terminator Armor [7 PL, 129pts]: Chainfist, Storm bolter
+ Troops +
Tactical Squad [5 PL, 77pts]
4x Space Marine
Space Marine Sergeant: Bolt pistol, Power fist
Tactical Squad [5 PL, 69pts]
4x Space Marine
Space Marine Sergeant: Bolt pistol, Power sword
Tactical Squad [5 PL, 72pts]
4x Space Marine
Space Marine Sergeant: Chainsword, Plasma pistol
+ Elites +
Venerable Dreadnought [8 PL, 156pts]: Twin autocannon, Twin autocannon
+ Fast Attack +
Bike Squad [5 PL, 118pts]
Biker Sergeant: Combi-flamer, Twin boltgun
Space Marine Biker w/Special Weapon: Plasma gun, Twin boltgun
Space Marine Biker w/Special Weapon: Plasma gun, Twin boltgun
+ Dedicated Transport +
Razorback [5 PL, 115pts]: Twin lascannon
That's 135 points left to spend and I put lascannons on the razorback because there's not a lot of anti tank in your selection. Frankly I think you don't have enough models kicking around to fill out 1000 points in a balanced way. Using the Terminators as captains puts over 25% of your points into
HQ which, in my opinion, is not a good idea. I'd recommend you expand the force with a box of scouts and a box of devastators to come to the following:
++ Battalion Detachment +3CP (Imperium - Space Marines) [59 PL, 998pts] ++
+ HQ +
Captain [5 PL, 78pts]: Bolt pistol, Power sword
Captain [5 PL, 81pts]: Chainsword, Plasma pistol
+ Troops +
Scout Squad [6 PL, 55pts]
Scout Sergeant: Boltgun, Chainsword
4x Scout w/Boltgun
Tactical Squad [9 PL, 140pts]
8x Space Marine
Space Marine Sergeant: Boltgun, Chainsword
Space Marine w/Heavy Weapon: Heavy bolter
Tactical Squad [9 PL, 143pts]
8x Space Marine
Space Marine Sergeant: Boltgun, Chainsword
Space Marine w/Special Weapon: Plasma gun
+ Elites +
Dreadnought [7 PL, 136pts]: Twin autocannon, Twin autocannon
+ Fast Attack +
Bike Squad [5 PL, 118pts]
Biker Sergeant: Combi-flamer, Twin boltgun
Space Marine Biker w/Special Weapon: Plasma gun, Twin boltgun
Space Marine Biker w/Special Weapon: Plasma gun, Twin boltgun
+ Heavy Support +
Devastator Squad [8 PL, 165pts]
Space Marine Sergeant: Boltgun, Chainsword
Space Marine w/Heavy Weapon: Lascannon
Space Marine w/Heavy Weapon: Lascannon
Space Marine w/Heavy Weapon: Missile launcher
Space Marine w/Heavy Weapon: Missile launcher
+ Dedicated Transport +
Razorback [5 PL, 82pts]: Twin heavy bolter
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It's still vulnerable to standoff shooting at the infantry (tell your kids to hide them, or put them in cover, or preferably both), but it has decent anti-tank capability, a fair number of boots on the ground and a bit of wiggle room in deployment with the scouts.