Would be cheaper to keep using the existing cabling so it means going for CVI or TVI system.
Most brands are now up around 5MP for this technology being Dahua, Hikvision or TVT
Most likely it is just the internal fan that is noisy, might be blocked with dust.
IP is good and more future proof with more advances in megapixel and the image technology. Generally the standard at the moment is 5, 6 and 8MP cameras
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