Which Prime, 10mm or 18.5mm on V1

A 6 mm WA is what I'm waiting for.

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http://markbc.net/
Nikon D300
Nikon D7000
Nikon D40x
Nikon D40
Nikkor 70-300 VR
Nikkor 300 F/4 AF-S
Nikkor 70-200 F/2.8 VRII
Nikkor 1.4X TC
Nikkor 2.0X TC Version III
Nikkor 18-55 kit lens
Nikkor 18-105 kit lens
Nikkor 35 f/1.8
Sigma 10-20 older version
Canon 500D close up filter
Nikon SB 600 flash
Canon HF10 camcorder
Canon HF200 camcorder
Canon WP-V2 underwater housing for HF200
Three GoPro HD Hero video cameras
Okay, too much stuff, yes I know I need to whittle it down a bit.