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I am trying to build a 1500 point shooty space marine army. Any suggestions?

One suggestion is to put your lascannons and plasma cannons with your tatical squads and putting your multi melta, heavy bolter, and missile launcher with your devastator squads because it'll be cheaper in your army.
In a devastator spuad the lascannon costs 30 while in tatical it costs 10, see the difference.