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14mm and above Pentax XW perform worst in fast Newtonian's due to induced field curvature added by a different lense design from the 10mm and below. A paracorr will reduce or eliminate that problem though due to it correcting the field by flattening it. If you already have a paracorr than its alright. In my opinion its not particularly good value if you need to purchase a paracorr with a Pentax XW 14mm or above with the intention of using it to clean up the views in the eyepiece.
To answer the OP. I would go with the Pentax 7mm since that's the only option given. You should hunt for a Vixen LVW 8mm. I looked through one. I think it belonged to Wavy or was it Geoff? Don't remember. The view however was superb in my 12". I tried a Hyperion 8mm in my 12" and I didn't like to be honest.
Your mileage may vary however.
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