My current 1000 pt list, I'd like to expand it.

[Grumph]

Grumph's Tribe
from the Scalded Delta. A swamp tribe. We love water, mud and the like.

Lords and Heros
Grumph (1#, 258 pts)
. . 1 Slaughtermaster, 258 pts Hand Weapon; Ironfist
Torphs (1#, 149 pts)
. . 1 Bruiser (Battle Standard Bearer), Hand Weapon; Ironfist; Light Armour; Battle Standard Bearer; Brawlerguts

Troops

Ironguts (6#, 278 pts) Musician and GutLord
. . Great Weapon; Heavy Armour

Ogres (5#, 180 pts) Musician , Crusher, BSB comes in here.
. . Hand Weapon; Ironfist; Light Armour

Special

Leadbelchers (4#, 192 pts) Musician, Thunderfist
. . Hand Weapon; Leadbelcher Gun; Light Armour

Total Roster Cost: 1057


This is currently what I have on the table - need to finish assembling some still.  I'm now in the process of adding things to this  and I'm considering buying the following kits

• Ogre battalion
• Mournfang x2
• IronBlaster

The Ogre battalion would make 1 more Leadbelcher and the rest would be split between IG and Ogres. I would build standards for both units.
Mournfang would be FC too.

Is this expansion a good idea or should I think differently to make my army a bit bigger ?

Grumph ...

[Alphadork]

Your purchases look fine.

IIRC the new battalion give you 6 ogres, 6 IG's and 4 LB's.

I suggest the following:
Make 2 more LB's gives you a unit fo 6
Make 3 more IG's - unit of 9
Make 4 more Ogres with IF's - unit of 9
Assemble the MF's with HW and IF (trust me)

That leaves 7 ogres to work with. The extra bitz on the MF, IB and battalion sprues can be used to make a good looking unit of 6 Maneaters (the MF sprues even have pistols if that's how you want to equip your ME's) leaving one ogre model for an extra character conversion.

Also, don't forget to use all the gnoblars on those sprues to make a unit of 10.
 
The other thing I suggest buying are 2 or 3 sabretusks - they're great when fielded as singles.   

Just me two gnoblars worth
The Alphadork