spesh far xc travel possibilities

I'm thinking of selling my xc pro in order to fund buying a pitch as I fancy more travel. However, I'm wondering TiVo could exchange the forks on my current bike. what am I likely to get away with before ruining the handling? Current travel is 120mm
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Parktools :?:SheldonBrown
already has a 67 degree head angle, so shortening the forks by 20mm i likely to take that HA to 68, which isnt that different to what you've currently got
Tracey
Bouncy
Carbon
Here's mine:
2012 Nukeproof Mega
2011 Haro Flightline Expert
2010 Spesh FSR XC Pro
It does perform quite well with 140mm up front
Tracey
Bouncy
Carbon