CommentLuv Premium is one of the best blogging tools I have come across.
It is a plugin that I highly recommend for self hosted blogs. I use it on my main blog and have been very pleased with its performance.
It helps build traffic, cut down on spam and has been a very useful tool for building community. I highly recommend it and would love for you to check it out.
That is an affiliate link above so if you are interested I would ask that you click on my link so that if you choose to purchase it I will get credit for it.