The pred will get lonely at the back by himself. Maybe a
rifledread would be better so it can slowly make its way forward whilst being to hit back in
cc. Also your pred is expensive.
The attack bikes and the dread are both suicide melta units, they are bound to die which is fine but do you need two? Plus
HF/
MM speeders would do a better job than the role of the attack bikes.
The Landraider is a lot of your points in one model, with the occupants needing the vehicle to have a fun time.
Basically you have 4 gambles there, that is a little too many. I am going to say the most important is the 'raider.
So I would suggest another rhino. Guess that means sternguard or another tactical squad, this will cover the land raider and will support the other rhinos better.
Especially if you have three rhinos, you want meltas shooting out of rhinos, I would have 1 antiinfantry but 2 antitank. Antiifantry could be 4 combimeltas and 2 heavy flamers as a 6 man sternguard, then melta and combimelta for your tactical squads.
Then another pred will support the long range attack and make the suicidal elements less important as you can shoot important targets from range.
The following is 1540. It leaves your suicide melta squads at home to supply extra protection for the raider, whilst giving you a bit more long range attack so you can wait to get into melta/flamer range
Vulkan 190
termies in 'raider 450
5 sternguard with 2 combimeltas and 2 heavy flamers 190
Tac. rhino,
ML,combimelta, melta,fist 235
Tac. rhino,
ML,combimelta, melta,fist 235
pred las/auto 120
pred las/auto 120