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You could look into Black Templars, they've got the cross much like the one in the pic there, just paint em up white and red

For the spear, max mini do a range of weapons and just released some vibro spears i think they were called

Edit:Ah, linky: http://www.maxmini.eu/store/index.php?main_page=product_info&products_id=110

They've got 6 in the box, so if you wanted to do up an honour guard with em as well, it'd be a grand wee purchase.

I thought of GKs too, but since the current models are being phased out-the packs of 5 are no longer available for example and the army is/was entirely metal.
BTs suit the idea perfectly, and since vanilla marines are drowned in plastic. BT upgrade packs ftw. Would quite like to see white templars for a change, hope you get a blog up whatever you decide!