Don't mean to give you the idea that you're a worthless maggot who's doing it all wrong or anything!

But once you've been playing for a bit you might realise that you pay a lot for upgrades and they don't add a corresponding amount to your army's power. Total the points spent on upgrades in your list and you'll see what I mean. I think the models you've listed would make a great 1500 point list, which is good, a great size to play at. here's a rough list of your models fielded with reduced upgrades:
Company command squad - Leader with Power fist, Melta Bombs
Medi-Pack
Vox-Caster
Standard Bearer
2 flamers/grenade launchers
All with Krak Grenades and Carapace Armor. (155 pts)
2 x Platoon Command Squad - Leaders with Power Fist, Melta Bombs
Standard Bearers
Vox Casters
2 flamers/grenade launchers
All with Krak Grenades. (170 pts for both)
6 x Infantry Squad (10's) - Sergeants with Power Weapon and Melta Bombs
2 vox-casters (one in each platoon)
Mix of Meltagun/Flamers
All with Krak grenades. (460 pts + weapons)
I advise putting cheap heavy weapons in these squads. at 10 pts an autocannon is great even if you move and don't use it sometimes. seems expensive in £ but the heavy weapon sprue can actually make several different weapons.
3 x Heavy Weapons Squads - Various Weapon Upgrades
(270 pts)
Scout Sentinel Squad - 3x autocannons, 3x hunter-killer missiles (150 points)
Leman Russ - lascannon, heavy bolter sponsons (185 pts)
Leman Russ - lascannon, heavy bolter sponsons (185 pts)
Leman Russ - lascannon, heavy bolter sponsons (185 pts)
Total = 1760
Don't mean do be really domineering or pushy - I'm not suggesting you need to use this list or anything (I think a lot of people on this site would consider this list not so great anyway) But you can see how many points can be saved by not buying too many upgrades. a totally naked leman russ costs 150 points, but its still got the heavy armour and battlecannon of your upgraded ones (230 pts). I really do hope that helps. I get the idea you wanted to get a 2000 point list in one step, but maybe you should consider playing at 1500 pts first - its enough models to be interesting, but you don't have to make quite so many decisions about what models to buy. There's a lot of stuff you can do to make
IG less hard on the wallet - heavy weapons and command squads can be combined with cheaper basic troops so you don't have to buy a command squad box or a heavy weapon team for every single one in your army list; weapons on sentinels and leman russes can be magnetised, which is surprisingly easy and convenient.
PM me if you have any questions on this sort of thing, or I'm sure there are tutorials on this site written by blokes more knowledgeable than I am.
Good luck, may your lasguns roll 6s to wound!