6th ed Space Marine Base

This is the space marine base for a 2000 army (so 1400+600 of whatever allies I decide on)

MotF-Conversion beamer-120
Dread-MM, HF-115
Dread-MM, HF-115
Scouts (10)-Sniper Rifles, Telion-200
Tact Squad(10)-MG, MM, Sgt w/ PF and Combi-M, Rhino-245
Tact Squad (10)-MG, MM, Sgt w/ PF, Rhino-235
Attack Bike Sqd (2)-2x MM-100
Attack Bike Sqd (2)-2x MM-100
Pred-A/C, HB Sponsons-85
Pred-A/C, HB Sponsons-85

I can also replace a Dread/Bike combo w/ a Rifleman dread and a Typhoon for the same points.

At that point I can add whatever I happen to be working on.... Guard, Grey Knights, any of my other Marine armies, or even my orks.

A few add-ons

600 Pts - Grey Knights Roster

Total Roster Cost: 600

HQ: Grey Knight Brother-Captain (1#, 150 pts)
1 Grey Knight Brother-Captain, 150 pts

Troops: Grey Knight Terminator Squad (5#, 225 pts)
1 Grey Knight Terminator Squad, 0 pts
1 Terminator Justicar, 40 pts
1 Terminator, 65 pts = (base cost 40 + Psycannon 25)
2 Terminators, 80 pts = 2 * 40
1 Terminator, 40 pts

Troops: Grey Knight Terminator Squad (5#, 225 pts)
1 Grey Knight Terminator Squad, 0 pts
1 Terminator Justicar, 40 pts
1 Terminator, 65 pts = (base cost 40 + Psycannon 25)
2 Terminators, 80 pts = 2 * 40
1 Terminator, 40 pts

600 Pts - Dark Angels Roster

Total Roster Cost: 600

HQ: Belial, Master of the Deathwing (1#, 130 pts)
1 Belial, Master of the Deathwing, 130 pts

Troops: Deathwing Terminator Squad (5#, 235 pts)
4 Deathwing Terminator Squad, 192 pts = 4 * 43 (base cost 43) + Cyclone Missile Launcher 20
1 Sergeant, 43 pts

Troops: Deathwing Terminator Squad (5#, 235 pts)
4 Deathwing Terminator Squad, 192 pts = 4 * 43 (base cost 43) + Cyclone Missile Launcher 20
1 Sergeant, 43 pts

600 Pts - Imperial Guard Roster

Total Roster Cost: 600

HQ: Company Command Squad (5#, 115 pts)
4 Company Command Squad, 89 pts = 4 * 6 (base cost 6) + Krak Grenades 5 + Medi-pack 30 + Regimental Standard 15 + Vox Caster 5 + Meltagun x1 10
1 Company Commander, 26 pts

Troops: Infantry Platoon (25#, 170 pts)
1 Infantry Platoon, 0 pts
4 Platoon Command Squad, 29 pts = 4 * 6 (base cost 6) + Vox Caster 5
1 Platoon Commander, 21 pts = (base cost 6 + Power Fist 15)
9 Infantry Squad, 55 pts = 9 * 5 (base cost 5) + Vox Caster 5 + Grenade Launcher x1 5
1 Sergeant, 5 pts
9 Infantry Squad, 55 pts = 9 * 5 (base cost 5) + Vox Caster 5 + Flamer x1 5
1 Sergeant, 5 pts

Heavy Support: Leman Russ Squadron (1#, 185 pts)
1 Leman Russ Squadron, 0 pts
1 Leman Russ Battle Tank, 185 pts = (base cost 150 + Lascannon 15 + Heavy Bolter Sponsons x2 20)

Fast Attack: Vendetta Gunship Squadron (1#, 130 pts)
1 Vendetta Gunship Squadron, 0 pts
1 Vendetta, 130 pts

Im really liking all of your lists. Im big into the themed armies. In my opinion the grey knights or guard fit best but the Dark angels one could offer serious benefit in the form of rock solid troops (belial is still awesome for that). In all honesty i have yet to play a game of 6th so i cant give very much feedback at this point other than from what i know this looks to be a good list(s).