People often try to suggest that how to optimize your blog with n-number of plugins – but with various plugins involved in your wordpress site there might be a possibility that your wordpress loads slow.
Slow loading of wordpress/blog might irritate the visiting user and could also prove negative for your blogging.
In my view that I have marked with my blog and blogging is that you should before taking care of anything else should worry or care on the content and with less or no SEO plugin your blog would still prove to be optimized.
In the blog content you should take care of the keywords involved in your niche and should also try to find the competitive keywords related to your niche and try to include the same in your blog content.
As this method could prove more optimized than any other plugin – you can say it like this also: Plugin enhances but content aggregates.