Chapter masters are not great options. They are too expensive for what you get. Go for a librarian instead, they are the best basic HQ choice in the codex.
Normal terminators really want a cyclone missile launcher as the heavy weapon, it is much better than the heavy flamer, and starts shooting from turn1.
Plasma cannon are interesting options on the dreadnoughts, and could be useful, however when dropping them multi-melta is best so they can destroy a tank if they need too on the turn that they drop. Also try and fit a 3rd drp pod in the army, so you can drop both of the dreadnoughts on turn 1.
Yes, you have far too many troops. Tactical marines are distinctly average and scouts are so-so really.
If you're going to run scouts run 1 full squad of 10 with Telion, sniper rifles and a missile launcher. It is the best combination for them. (and the only one that is really worthwhile).
In 2000pts I would run only 2 squads of tactical marines (to go with the 1 scout sqaud) with multi-melta and flamer. Rhinos for both of course. (I do actually run these unit in my 2000pt army).
I would consider bumping up the terminators to a full squad of 10 and getting 2 cyclone missile launchers.
Land speeders or predators are also pretty good options.
Hope this is useful.
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