You need the right materials, not the 'best' ones. - to me, pittards serve no purpose on a keeping glove.
As suggested, I believe D3o is exclusive to GM for cricket, so I would warn you to tread carefully in this area.
Poron (I remain convinced by George from Stretton Fox until proven otherwise) isn't effective for cricket gloves, and actually has the potential to do more harm than good.
Kangaroo and aniline are some of the industry leading materials so I can't argue there. Crocodile is a cool concept, will it be supple enough? I don't have much experience, all I can think of is brightly coloured croc skin wallets on sale in South East Asian markets.
The rrp on the kookaburra players wicket keeping glove is £150 so I don't believe price should be a huge turnoff, although you will cut out a large portion of the market at this price. These gloves are far from our best sellers.