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I think the ideal size is below 500k, yet I feel Google will crawl even larger sized pages if the content provides value for the users.

Back in 2005 I remember Google had much tighter figures on these types of numbers yet in today's market it is a bit different, they seem to allow larger file sizes.

Some plugins I advise are worth looking at are:

• All in one SEO.

• Sharing is SEXY

*** Google Analytics for WordPress**

***** Google XML Sitemaps

***** SI CAPTCHA Anti-Spam

***** 404 SEO Plugin (good 404 plugin I have used)

You also need to test what will work best for you