Just a quick note, try and separate your list a bit, at the moment its just one big block, its not to difficult to make out, but it makes it a bit harder.
I'll go through your list in a bit of detail to try and give you some advice (feel free to ignore it all

)
HQ:
2 Chaplians. I'm not sure about this, without looking through the rest of your list, the immediate thing to do here, is drop a Chaplain for a Librarian to give you a Psychic hood, maybe Null Zone as well, or any of the other powers that you think will be useful.
Troops:
5 Troops at 2000 is more than enough, 1 per 500 points is probably a good amount to aim for (when 1000+ points of course, you need 2 if your playing less anyway). I don't really like any of the Scout set ups here.
BP/
CCW with a combi-flamer/
PF sgt will be alright, but won't bring too much
CC punch, and after combat will be a very easy target to kill. And they aren't much good for holding objectives especially. Big squad is alright, but i personally like 5 man Sniper teams, with 1
ML, not sure if the Heavy Bolter really fits into a Sniper squad. Your
Tac squad is ok, but not necessarily the best load out, try to add a
MM, then you can sit the rhino still, maybe in cover and shoot the Melta and
MM out of the top hatch.
Elites:
I love these
I personally run all
TH/
SS because its 'harder' to kill (only when more than 5
inv saves are needed) but 1 or 2
LC per squad gives it an advantage sometimes.
Fast:
Obviously no good if you change your small scout squad, but even in Land Speeder Storms, i don't think they will do half as much damage as you will expect/want/need.
Heavy:
Maybe try to get
MM on both of these. Consider changing on to a Crusader or Redeemer maybe for horde killing.
Essentially, sticking with the Land Raider and Terminator combo (something that i use, and find quite enjoyable, although its not as rock solid as it used to be, and some games you will really get slaughtered), you have a number of options. What you have now, might work, but i'm not so sure. This 'might' be a bit better.
Chaplain 100
Librarian 100
Terminator Assault Squad 200
Terminator Assault Squad 200
Tactical Squad (Melta,
MM, Combi-Melta/
PW) 200
Tactical Squad (Melta,
MM, Combi-Melta/
PF) 210
Tactical Squad (Melta,
MM, Combi-Melta/
PF) 210
3x Rhino 105
Land Raider (
MM) 260
Land Raider Crusader (
MM) 260
Gives you 1845, which means you could then add a couple of
MM/
HF land speeders, or a Drop podding Dread.
Thats just an option, its by no means perfect, perhaps someone with experience at 2000 points could come along and help you build a more solid version.
Hope that helps somewhat anyway.