I'm looking for a review system for my website and have looked heavily into PowerReviews and have even begun implementing it but also I'm wondering about RateVoice. When I did my research I had come up with about 6-8 review systems but ruled out all but the two above. PowerReviews is expensive at $80/month and RateVoice is only $29.95 but may not have as many features. I'd rather simply pay once and have it as part of the website but I know how important reviews are so want a good system.
Has anyone tried the two above and can tell me if one is better or do you have another system you suggest?

Thank you for your help.