Any handwriting experts out there?

I'm trying to transcribe a letter that was written by some Scotch-Irish ancestors of mine in the 1850's and am having a bit of trouble deciphering the handwriting. I've gotten pretty good at reading the handwriting from old documents, but there are a few places in the letter where I'm thrown for a loop. If you happen to have some experience reading old Scotch-Irish handwriting, or even if you don't but want to take a stab at it, I'd love some help and a second opinion. They're also writing from a place that I think is called Laughries Caus (I THINK the letter says: "When you Rite Direct Letters to the Care Mr James Moor Mohill Street grween newtown was Cunty Down Irland for William Mcgimpsey of Laughries Caus, farmer."), but I can't find any Laughries in Ireland, so if you know where they are writing from, that'd be great too. Thanks!

And as soon as I have what I think is a pretty accurate transcription, I'll post the letter here. It's from William and Marget McGimpsey to their son Henry and is dated April 2, 1854.

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Update: I'd like to thank all the folks who offered help! I also wanted to pass on a few really useful links that people sent me.

• BiB, Apple and Pam helped me identify the origin of the letter writer as Loughriscouse, Newtownards Parish, County Down (map of townlands in Newtownards Parish)
• Megan sent me a link to the Paleography page at the National Archives UK website that has a lot of information and tutorials on reading handwriting from 1500-1800.
• Pam also sent me a link to Ros Davies' Co. Down, Ireland Genealogy Research Site, which has a lot of great info on people and places in County Down