Spell Check Plugins

Someone in my Christian group at church has been reading my blogs which he said are quite great but he said there are a lot of typos in the blog posts. I tried a few spell check plugins but all have failed.

I live in Jamaica right now so I am conforming to the British style of spelling but a lot of the spellings are universal with a few exceptions. Can anyone recommend a great spell check wordpress plugin I can use on all my blogs that can conform to the American, British spellings or otherwise as long as it’s accurate?

I need to promote my blogging brand but I am going to look silly if I keep making errors. So far all the spell check plugins I’ve used are not even doing a good job. Nothing gets detected. This was the case in Windows Live Writer which didn’t detect basic spelling errors unlike Microsoft Word which questions a lot more. I need a spell check plugin that works with many spelling styles, mainly USA and British. Please assist.