Giant NRS - need help!

i am doing up my 05 giant NRS which has the NRS rear shock which has 4in travel and forks with 100mm travel. I was wondering if getting new shocks which have more travel (5-6in and 120mm) will alter the geometry too much therefore affecting the balance etc.. of the bike. Also if a bigger rear shock would fit on the bike.
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My 2012 Remedy
VOODOO CANZO
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http://www.rutlandcycling.com/9243/Rock ... -3-1-.html
I set the sag then set the platform so it doesnt bob then forget about it.
So i would have a look at people recommendations for a budget 100mm travel air fork that performs well.
Hope this helps.
Carbon 456
456 lefty
Pompino
White Inbred