Hi Juli -
Re: Sinclairs in Dunoon & Kilmun parish, Neil Sinclair (Canada) has ancestors who emigrated from Glendaruel in Argyll County to PEI. I've been poking around, trying to connect my Duncan Sinclair (b. 1781-2 in Scotland). A high proportion of those Scots living in North Carolina came from Argyll County. I've noticed that many, many Sinclairs from Glenorchy & Inishail parish moved south to Dunoon & Kilmun parish. Dunoon is just across from the port of Greenock, and it appears that many in that area made their living on/from the sea. I personally have only looked at records pre-1800.
The Scottish parish registers (christenings and marriages) are available on computer through the LDS Church at their local family history branches. Check your phone book under "The Church of Jesus Christ of Latter-Day Saints." If they don't have a listing for a family history center, just start calling numbers and ASK! To be sure to get someone, call on a Sunday between 8 am and 4-5 pm. Their centers are open free to the public. Even if you're not in the United States, you should still check your phone book!!!
Hope this helps.
P.S. NEIL - How's the article coming?! I'd love to see the next draft!