[Closed] Help picking correct rigid fork for 29er.

I have just got a [url= http://www.merida-bikes.com/en_gb/bike/2013/55/MTB+Hardtails/Big.Nine+TFS+300 ]Merida Big Nine 300[/url] and Im looking to get rid of the horrible fork and swap it with an Exotic.
The thing is, the front is to high for me as it is, so I noticed [url= http://www.ebay.co.uk/itm/White-eXotic-Rigid-Carbon-Fork-Post-Mount-Disc-42-5-/140917176948 ]this one, but it is 42.5cm[/url] and mostly a 46.5cm is recommended.
The 29er fork is also £30 more expensive, so that's swaying me even more towards the shorter one, but will it affect the bike that much?
I already have a 120mm adjustable stem aiming down quite a bit! I like a lower front.

Any ideas?