Peter, the three you already have are great eyepieces. I have the TV Plossls and as Malcolm says, they are fab, if not a little lacking in relief at the shorter lengths. The 11mm is just ok, but the 8mm is very short on eye relief. Combine that with the narrow FOV and I'd not recommend it for Dob use.
The Parks Gold Series are excellent, I have the 25mm and it's as good an eyepiece of any I've owned. You could do worse than going for a 10mm in the same series, but they don't come up very often here in Aus.
A Tak LE would be a good choice too.
Money no object, for Dob use I'd go for the Nagler Type VI 9mm. I have this eyepiece and in my 8 inch f/6 Dob it is the ducks nuts.
Cheers,
Jason.
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