With guard, 6 squads isn't very hordey.

A basic guard squad of 10 men comes to 50 points, give 'em an Autocannon and Grenade Launcher each and 3 flamers to the command squads, and you're looking at 480 points for those 70 dudes.
One version of a very solid troops core for a larger army:
Infantry Platoon
+ Command Squad
- Platoon Commander
- 3 x Guardsman with Flamer
+ Infantry Squad
- Guardsman with Grenade launcher
- Guardsmen Weapons Team with Autocannon
- Upgrade to Sergeant
+ Infantry Squad
- Guardsman with Grenade launcher
- Guardsmen Weapons Team with Autocannon
- Upgrade to Sergeant
+ Infantry Squad
- Guardsman with Grenade launcher
- Guardsmen Weapons Team with Autocannon
- Upgrade to Sergeant
+ Infantry Squad
- Guardsman with Grenade launcher
- Guardsmen Weapons Team with Autocannon
- Upgrade to Sergeant
+ Infantry Squad
- Guardsman with Grenade launcher
- Guardsmen Weapons Team with Autocannon
- Upgrade to Sergeant
- - - > 370
Infantry Platoon
+ Command Squad
- Platoon Commander
- 3 x Guardsman with Flamer
+ Infantry Squad
- Guardsmen Weapons Team with Laser Cannon
- Upgrade to Sergeant
+ Infantry Squad
- Guardsmen Weapons Team with Laser Cannon
- Upgrade to Sergeant
+ Infantry Squad
- Guardsmen Weapons Team with Laser Cannon
- Upgrade to Sergeant
+ Infantry Squad
- Guardsmen Weapons Team with Laser Cannon
- Upgrade to Sergeant
+ Infantry Squad
- Guardsman with Grenade launcher
- Guardsmen Weapons Team with Laser Cannon
- Upgrade to Sergeant
- - - > 400
770 points
That's 110 bodies for pretty few points, and gives you five squads with Autocannons and GLs that can hunt light vehicles and also shoot at infantry pretty well, and five squads sporting lascannons with plenty of ablative wounds. The Platoon commanders have three flamers each and hang behind the infantry, ready to grill anyone who eats one of your squads in CC. Solid core you can add to with veterans in Chimeras, artillery, flyers and tanks.