Badmarsh, you're a ledgend. Thanks for the amazing tips! Sadly I don't have sabretusks or an iron blaster yet 
What I can say is that I have played 4 games so far with my initial list and won all 4. Played against lizardmen (twice), high elves and empire and I have had amazing success with the giant. Maybe its because the games are small and I only face one artilrty piece in every game.
Thanks again for the input guys
@badmarsh could you expand on why you don't like death? Maw seems so tame...
Hi Mawler thanks for the bigup! Not sure what I have done but I have a huge cheesy grin on my face at the moment :-D
I don't dislike Death Magic
per se, I've done a "pros" and "cons" of the lore below:
Pros(1) Lore Attribute - great to get more powerdice.
(2) Spirit Leech - great against low leadership enemy characters.
(3) Doom and Darkness - can be great to break unstubborn units.
(4) Fate of Bjuna - great against low toughness models.
Cons(1) Death magic uses a character's unmodified leadership. SM's have leadership of 8, which is not that good compared to most other Lords out there.
(2) Aspect of the Dreadknight - all Ogre Kingdoms units bar Gnoblars cause fear already!
(3) Soulblight, casting the Beast's signature spell is easier for a similar effect.
Purple Sun is great if you can pull it off against the enemy, bad if it hits your own low initiative units!
Death-fisting is sadly no longer possible, which was great to remove enemy wizard levels, even if they did not get injured!
Ogre Matt has made a good suggestion about proxying, can be a cheaper way to get the model!
As you have a perfect record so far, I would be tempted to recommend going with the saying:
"If it ain't broke, don't try to fix it!"
I've never used a Giant before but sounds that they are pretty effective in low level games. Which enemy units did you crush (literally!)?
Some players are against tailoring lists against specific opponents but it great generals know the strengths and weaknesses of each opponent, so it is an individual's call in the end!